The values of q1 and q2 in which the resultant electric force exerted on each of the other three charges zero is - 4C.
What is the value of q1 and q2?
The value of charges q1 and q2 is calculated by applying the formula for electric force as shown below.
F = (kqₙqₓ) / (d²)
where;
K is Coulomb's constantq is the magnitude of the chargesd is the distance between the chargesIf the force exerted on each of the other three charges is zero, then
F₁₃ + F₃₄ = 0
F₂₃ + F₃₄ = 0
F₁₃ = (k x q₁ x 8) / (d²)
F₂₃ = (k x q₂ x 8 ) / (d²)
F₃₄ = (k x 8 x 4 ) / (d²)
F₁₃ = - F₃₄
(k x q₁ x 8) / (d²) = - (k x 8 x 4 ) / (d²)
8q₁ = - 32
q₁ = -32 / 8
q₁ = - 4 C
F₂₃ = - F₃₄
(k x q₂ x 8 ) / (d²) = - (k x 8 x 4 ) / (d²)
q₂ = - 4 C
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A thin lens has a crescent shape, which is defined by two spherical surfaces A and B. The radius of the surface A is |RA| = 3a, and of surface B is |RB| = a. The lens is submerged in a medium.
What is the magnitude of the focal length |f | in the small angle approximation? Assume the index of refraction of the lens is 2.0 and of the medium is 1.0.
Light refraction in spherical lenses & the lens maker formula are the notions that should be applied to the problem at hand. Utilize the lens mfg rule to get the fov of fixed lens & it verify if it is a high or low length.
Why would someone use a spherical lens?A optical lens with such a contour that allows light beams to converge in diverge is called a spherical lens, also referred to as a singlet. One reason why spherical lenses are among the most popular ones is that they can project pictures onto the sensor with changing their aspect ratios.
What different spherical lens types are there?It's an optical apparatus that the light rays pass through to converge / diverge before communicating. Thus, convex or convergent lenses and concave or divergent lenses are the two main categories of spherical lenses.
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compare the magnitude of the stone's velocity and the magnitude of the pulley's linear velocity at the point of contact between the wire and pulley. compare the magnitude of the stone's velocity and the magnitude of the pulley's linear velocity at the point of contact between the wire and pulley. the magnitude of the velocity of the stone is less than that of the point of contact. the magnitude of the velocity of the stone is the same as that of the point of contact. the magnitude of the velocity of the stone is greater than that of the point of contact.
The magnitude of the velocity of the stone is less than that of the point of contact.
What is velocity, exactly?The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The metre per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Alternately, the magnitude of velocity can be expressed in centimetres per second (cm/s). The velocity is the rate at which a given displacement changes. By figuring out the displacement to total time ratio, it may be calculated. The same as for speed, "m/s" is the SI unit for velocity. Velocity is a vector, whereas speed is a scalar. The letters v (italic) stand for velocity and v for speed (boldface). A bar appears over the symbol for average values.
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a 130 g air-track glider is attached to a spring. the glider is pushed in 11.2 cm and released. a student with a stopwatch finds that 14.0 oscillations take 9.00 s . Part A What is the spring constant
The spring constant can be calculated as: 12.51 N.
The formula for calculating the period of oscillation is written as the following:
[tex]T=2\pi \sqrt{\frac{m}{k} } \\[/tex]
m is the mass of the spring.
k is the spring constant.
Making the spring constant "k" the subject of the formula will give us the following expression;
[tex]k=4\pi ^{2} \frac{m}{T^{2} } \\[/tex]
Get the period of oscillation "T"
T= 1/f
frequency "f" can express the number of oscillations completed in one second.
If a student with a stopwatch finds that 12 oscillations take 15.0 s, the number of oscillations in one sec will be 9/14 = 0.64 osc.
Period T = 1/0.64 = 1.56sec
Get the required spring constant
[tex]K=4\pi ^{2} \frac{m}{T^{2} } \\k= 4(3.14)^{2}\frac{0.13}{0.64^{2} } \\[/tex]
K= 12.51 N
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Small spheres of diameter 1.05 mm fall through 20.0°C water with a terminal speed of 2.34 cm/s. Use 1.00 x 10-3 §a for the viscosity of water. Calculate the density of the spheres.
The density of the small spheres with a diameter of 1.05mm and a terminal velocity of 2.34 cm/s is 42.97m/s³.
What is Density?Density is a measurement which compares the amount of matter occupied by an object with its volume. An object with much matter in a certain amount of volume has high density. Whereas, an object with a little matter in the same amount of volume has a low density.
We know that density of water,
σ = 1.00 × 10⁻³ kg/m³ and coefficient of viscosity for water, η = 10⁻³ Pa.s
Given,
Terminal speed, v = 2.34 cm/s = 0.0234 m/s
Radius of sphere, r = d/2 = 1.05/2 = 0.525mm = 0.0005m
Using the formula of terminal speed,
v = 2(ρ − σ)gr²/ 9η
0.0234 = 2(ρ - 1.00 × 10⁻³) × 9.8 × 0.0005²/ 9 × 10⁻³
0.0234 = 2(ρ - 1.00 × 10⁻³) × 9.8 × 0.00000025/ 9 × 10⁻³
0.0234 = 2(ρ - 1.00 × 10⁻³) × 0.00000245/ 9 × 10⁻³
0.0234 × 9 × 10⁻³/ 2 × 0.00000245 = ρ - 1.00 × 10⁻³
0.2106× 10⁻³/ 0.0000049 = ρ - 1.00 × 10⁻³
0.0002106/ 0.0000049 = ρ - 1.00 × 10⁻³
42.97 = ρ - 1.00 × 10⁻³
ρ = 42.97m/s³
Therefore, the density of the small spheres is 42.97m/s³.
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forty-five seconds after a bowl begins to leak, the bowl is losing 0.33 ounces of liquid per second. let l(t) represent the amount of liquid that has leaked at any given time, and let t be measured in seconds. which of the following expressions represents this scenario?
The expression that represents the scenario forty-five seconds after a bowl begins to leak, the bowl is losing 0.28 ounces of liquid per second would be l(t) = 0.28t.
When a bowl begins to leak, it can be represented mathematically as a function of time, l(t). In this case, the bowl is losing 0.28 ounces of liquid per second, so after 45 seconds, the total amount lost would be 0.28 x 45 = 12.6 ounces.
This function can be used to calculate the amount of liquid lost over any given amount of time, depending on the rate of the leak. It is important to note that this calculation only applies to liquids with a known rate of flow.
The bowl's liquid level over time can be represented by the expression l(t) = 0.28t. This expression calculates the amount of liquid lost from the bowl each second.
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Explain the direct comparison method of measurement
Answer:
The direct comparison method of measurement is a method of comparison in which an unknown measurement is compared to a known measurement. This method is used to determine the size, weight, or volume of an unknown object by comparing it to an object whose size, weight, or volume is already known. For example, if you need to determine the weight of an object and have a known weight that is similar in size, you can compare the two objects and estimate the unknown weight. This method of measurement is often used in situations where a more precise measurement is not possible or practical.
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The radius and length of a steel cylinder are 40 mm and 110 mm, respectively. If the mass density of steel is 7850 kg/m3 , determine the weight of the cylinder in pounds.
The weight of the cylinder in pounds is 26.45 lbs.
Solving for the weight of the cylinder in pounds:To determine the weight of the cylinder in pounds, we first need to calculate its volume. The volume of a cylinder is given by :
V = πr²h
where,
r = the radius
h = the height (or length) of the cylinder.
Given the radius and length, we can substitute these values into the formula to get:
V = π * (0.04 m)² * (0.11 m) = 0.001539 m³
Since the mass density of steel is 7850 kg/m3, we can multiply the volume by the mass density to find the mass of the cylinder:
mass = 7850 kg/m³ * 0.001539 m³
mass = 12 kg
To convert this mass to pounds, we can multiply it by 2.20462 (1kg = 2.20462 lbs)
12 kg * 2.20462 = 26.45 lbs
Hence, the weight of the cylinder in pounds is 26.45 lbs.
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the additional heat causes the kinetic energy of some of the liquid molecules to ---select--- so they can more easily escape into the gas phase. therefore, the temperature of the boiling water remains constant. since some of the liquid water changes to gas, the amount of liquid water
The additional heat causes the kinetic energy of some of the liquid molecules to Increase So they can more easily escape into the gas phase.
When we add heat to the water immediately the temperature does not increase as before increasing the temperature the Kinetic Energy of molecules of water increases first and the heat is used for the same for increasing the temperature.
And As a result, the temperature of the boiling water remains constant. since some of the liquid water changes to gas, the amount of liquid water is. And the same phenomenon occurs when the water is boiling is starts becoming vapor instate of increasing the temperature it changes its state from liquid to gaseous.
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Water flows inside a horizontal pipe so that at the beginning of the pipe its velocity vi is lower than the velocity at the end of the pipe v2. Compare the pressures at the beginning P1 and at the end of the pipe P2. Pi < P2 P1 = P2 P1 > P2 Not enough information.
The pressure at the beginning and the end of the pipe cannot be determined without additional information.
What is velocity?Velocity is a vector quantity that measures the rate of change of an object’s position in a given direction. It is the rate of displacement over time, or the speed at which an object is moving. Velocity is the speed of an object in a particular direction. It is measured in meters per second (m/s) or kilometers per hour (km/h). Velocity is a combination of both speed and direction, and it can also be represented by an arrow pointing in the direction of motion.
The pressure at the beginning of the pipe (P1) will be determined by the pressure of the source supplying the pipe, such as a pump, as well as the friction losses that occur along the pipe. The pressure at the end of the pipe (P2) will be determined by the available pressure of the source supplying the pipe, the friction losses that occur along the pipe, and the velocity at the end (v2). As such, without knowing the source pressure, the friction losses, and the velocities, it is impossible to determine whether P1 is less than, equal to, or greater than P2.
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Need the answers can someone help me please
An update can be caused by changes to props or state. These methods are called in the following order when a component is being re-rendered.
what is the co ordinates of initial and terminal points?
The length of the arrow indicates the magnitude of the vector, and the direction of the arrow is the direction of the vector. The point at the tail of the arrow is called the initial point of the vector, and the tip of the arrow is called the terminal point.Vectors are identified by magnitude, or the length of the line, and direction, represented by the arrowhead pointing toward the terminal point. The position vector has an initial point at (0,0) and is identified by its terminal point ⟨a,b⟩.Zero vector A vector whose initial point and terminal point both lie at the origin; denoted by 0 = 〈0, 0〉.
The terminal point p(x, y) on the unit circle determined by the giving value of t = -3π/4 is determined to be P (1/√2, -1/√2 ).To learn more about coordinates refers to:
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a crate of mass 100 kg is at rest on a horizontal floor. the coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. a force f of magnitude 344 n is then applied to the crate, parallel to the floor. which of the following is true?
The statement about crate that is true is that D. The crate will not move.
Force is any interaction that, when unopposed, will change the motion of an object. The maximum force that static friction can exert on the crate is
μsFN = μsFw =
μs mg = (0.4)(100 kg)(10 N/kg)
= 400 N
Since the force applied to the crate is only 344 N, static friction is able to apply that same magnitude of force on the crate, keeping it stationary. [B is incorrect because the static friction force is not the reaction force to F; both F and Ff (static) act on the same object (the crate) and therefore cannot form an action/reaction pair.]
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Complete question: A crate of mass 100 kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A force F of magnitude 344 N is then applied to the crate, parallel to the floor. Which of the following is true?
A. The crate will accelerate across the floor at 0.5 m/s2.
B. The static friction force, which is the reaction force to F as guaranteed by Newton’s third law, will also have a magnitude of 344 N.
C. The crate will slide across the floor at a constant speed of 0.5 m/s.
D. The crate will not move.
E. None of the above
Hence option D is the correct choice.
The right statement is that the crate won't move.
Any interaction that alters an object's motion while it is unopposed is referred to as force. The crate can only withstand a maximum force of static friction of
μsFN = μsFw =
μs mg = (0.4)(100 kg)(10 N/kg)
= 400 N
The box is subjected to a force of just 344 N, therefore static friction may exert the same force, holding the crate immobile. [B is erroneous since F and Ff (static) operate on the same object, the crate, and so cannot form an action/reaction pair. F and Ff (static) are not the response force to F.]
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Note: The correct question would be as bellow,
A crate of mass 100 kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A force F of magnitude 344 N is then applied to the crate, parallel to the floor. Which of the following is true?
A. The crate will accelerate across the floor at 0.5 m/s2.
B. The static friction force, which is the reaction force to F as guaranteed by Newton’s third law, will also have a magnitude of 344 N.
C. The crate will slide across the floor at a constant speed of 0.5 m/s.
D. The crate will not move.
E. None of the above
Tim, with mass 76.6 kg, climbs a gymna- sium rope a distance of 4.3 m. The acceleration of gravity is 9.8 m/s². How much potential energy does Tim gain? Answer in units of J.
Answer: Tim gains a potential energy of 3227.93 Joules.
Explanation:
Tim, with mass 76.6 kg, climbs a gymnasium rope a distance of 4.3 m. The acceleration of gravity is 9.8 m/s². How much potential energy does Tim gain?
Data:
m = 76.6 kg
h = 4.3 m
a = 9.8 m/s²
Ep = ?
To calculate potential energy, we have the formula
Ep = m × g × hWhere
Ep = potential energym = massg = acceleration due to gravityh = heightSince it asks us to calculate Tim's potential energy, we should not do formula clearance.
Therefore, we substitute data in the formula and solve, then
Ep = 76.6 kg × 9.8 m/s² × 4.3 m
Ep = 3227.93 kg × m/s² × m
Ep 3227.93 N × m
Ep = 3227.93 Joules
Tim gains a potential energy of 3227.93 Joules.
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conduct an experiment to determine how the potential energy of a block is transformed as it slides down an inclined surface.
If a mass slides down an incline, and the slope is frictionless, the gravitational potential energy is transformed to kinetic energy as it descends.
What is kinetic energy?In physics, an object's kinetic energy is the energy it has as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a certain velocity. The body retains its kinetic energy after gaining it during acceleration until its speed changes. Kinetic energy is the energy that an item has as a result of its movement. If we wish to accelerate an item, we must apply force to it. Using force demands us to put in effort. After work is completed, energy is transferred to the item, and the thing moves at a new constant speed.
Here,
When a mass slides down an incline with no friction, its gravitational potential energy is converted to kinetic energy as it falls.
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pls help me with this
thanks
i think it also doubles in area
a phenomenon is modeled using n dimensional variables with k primary dimensions. the number of non-dimensional variables would be question 2 options: a. k b. n c. n-k d. n k
A phenomenon is modeled using n dimensional variables with k primary dimensions, so the number of non-dimensional variables would be option c. n-k.
Measurements with quantitative data and distinct sizes are referred to as dimensional variables. Variables with dimensions and yet no constant value are called dimensional variables. Non-dimensional variables, on the other hand, are things that lack both dimensions and a variable value.
Quantities with dimensions but no constant value are called dimensional variables. Non-dimensional variables, on the other side, do not have the value of any variable or even the dimensions. Physical quantities with changing values but no dimensions are typically considered to be dimensionless variables.
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assuming charge 1 is located at the origin of the x axis and the positive x axis points to the right, find the two possible values x3,r (the position of charge 3 to the right of charge 1) and x3,l (the position of charge 3 to the left of charge 1).
This is a physics problem involving Coulomb's Law, which states that the force between two point charges is given by the equation F = (k * q1 * q2) / r², where k is the Coulomb constant, q1 and q2 are the charges, and r is the distance between the charges.
To find the position of charge 3 to the right of charge 1, we need to find the value of x³,r such that the net force on charge 3 is zero. This is because if the net force on charge 3 is not zero, it will accelerate and move away from its current position.
Similarly, to find the position of charge 3 to the left of charge 1, we need to find the value of x3,l such that the net force on charge 3 is zero.
The exact value of x3,r and x3,l will depend on the values of q1, q3 and the distance from charge 3 to charge 1.
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4. On Earth the average atmospheric pressure at the surface is 1013254 Pa. If we assume that theradius of Earth is 6,4 x 10° m and the acceleration of gravity is 9.8 m/s®, what is the mass ofEarth's atmosphere? Hint: You will need to use the equations for force, pressure, and the surfacearea of a sphere, but you will need to anabyze the units to confirm how these get combined.) USCthe following values to solve this problem, {6 pts}1 atm = Peame= 101325 Pa; Rew =64x10%m; g=9.8 mV/s?Ending units:
If we assume that the radius of Earth is 6,4 x 10° m and the acceleration of gravity is 9.8 m/s®, than the mass of Earth's atmosphere is 5.322 * 1016 kg.
What is pressure ?
The magnitude of force applied to a certain region is referred to as pressure. So either a strong force or a strong force applied over a short area can cause a lot of pressure (or do both).
Why does air pressure exist?
The atoms and molecules that comprise the many layers of the atmosphere are continually moving in arbitrary directions. Despite their modest size, when they hit a surface, they apply pressure that humans perceive as a force.
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Create an expression for the direction of the cars average acceleration in terms of
The rate at which the velocity changes is referred to as average acceleration. To determine the average acceleration of anything, we divide the change in velocity by the amount of time that has passed.
What is acceleration?We refer to an object as accelerating when its velocity changes. As a result, acceleration is the rate at which a velocity changes over time. Acceleration is the common term used to describe an increase in speed.
For instance, the average acceleration of a crazy ball would be 20 cm/s/s if its velocity increased from 0 to 60 cm/s in 3 seconds. The marble's velocity will therefore rise by 20 cm/s per second as a result. You can better comprehend the operation by using the table below:
Note that an overview was given as the complete question wasn't found.
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Enter a formula for converting a speed given in meters per second to its value in kilometers per hour, using s as the given value.
s (km/h) =
The formula to convert the speed given in meter per second to kilometer per hour is m/s = 18/5 km/h.
The formula to convert the speed of kilometers per hour into the meters per second can be found as,
Let us say,
S km/h is the speed of the object, If we simply just put the value of the distance and time in the required quantity, we will get our results. so, we will put,
1 km = 1000 m.
1 hour = 3600 seconds.
S km/h = S 1000/3600 m/s
S km/h = S 5/18 m/s
18/5 km/h = m/s
So, the speed of the object can be converted by using the formula, 18/5 km/s = m/s.
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Explain the dynamic characteristics of instruments
Answer:
speed of response and response time , lag , fidelity,and dynamic errors are the dynamic characteristics of instruments.
the mesh-current method is a general technique for solving circuits. you have probably used the mesh-current method to solve circuits with constant sources and resistors. fundamentally, it involves writing kvl equations for each mesh in a circuit. when the circuit contains a dependent source, you must write a constraint equation for each dependent source, in addition to the kvl equations. if a current source is shared by two meshes, you must write a supermesh kvl equation and a supermesh constraint equation. to use the mesh-current method to find the steady-state response of a circuit with a sinusoidal source, follow these steps:.
The mesh current method, also known as mesh analysis, is a technique for solving planar circuits for currents (and, indirectly, voltages) at any point in the electrical circuit.
Mesh analysis: what is its purpose?In order to find the unknown currents and voltages in any circuit, mesh analysis is a potent and versatile technique. Finding the loop currents solves the issue because any current in the circuit can then be calculated using the loop currents.The mesh current method, also known as mesh analysis, is a technique for solving planar circuits for currents (and, indirectly, voltages) at any point in the electrical circuit. A planar surface can be used to draw circuits that don't have any wires crossing over it.The mesh current method, also known as mesh analysis, is a technique for solving planar circuits for currents (and, indirectly, voltages) at any point in the electrical circuit.To learn more about mesh current refer to:
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suppose a car's velocity is to the left, and its acceleration is to the right. which of the following describes this car's motion?
This car is undergoing negative acceleration, meaning that its velocity is decreasing as it moves to the left. The car's motion can be described as decelerating to the left.
What is acceleration?Acceleration is the rate of change of velocity. It is the rate at which an object's velocity changes over time. It is a vector quantity, meaning it has both magnitude and direction. Acceleration can be caused by a number of forces, such as gravity, friction, and applied forces. In one dimension, acceleration is the change in velocity divided by the time it takes for the change to occur. In two dimensions, acceleration is the rate at which an object's velocity vector changes in magnitude and/or direction. Acceleration can be positive, negative, or zero. Positive acceleration occurs when an object speeds up, negative acceleration occurs when an object slows down, and zero acceleration occurs when an object's velocity remains constant.
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Drag the correct arrow to the diagram.
The diagram shows a series of volcanic islands and a hot spot. Determine the direction of movement of the tectonic plate that helped form the islands.
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ocean
series of volcanic islands
motion of plate
hot
spot
Convergent boundaries occur when two plates move in the opposite direction until they collide and create mountains and volcanoes. In the image, the arrows direction is horizontal and oposite to each other.
What are convergent boundaries?
Collision area between two plates. The collition might occur between,
Two oceanic platesOne oceanic plate with a continental one, Two continental plates.When two oceanic plates collide, magma rises to the surface by crevices, creating volcanic arches. In these boundaries occur vertical movements and might originate from protruding areas. There is compressional stress between plates.
In the image, the arrows direction is horizontal and oposite to each other.
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When the volume of a gas is decreased at constant temperature the pressure increases because the moleculesO Strike unit area of the walls of the container more oftenO Strike the unit area of the walls of the container with giher speedO Strike the unit area of the wall of the container with lesser speedO Move with more kinetic energy
When the volume of a gas is decreased at a constant temperature the pressure increases because the molecules a. Strike the unit area of the walls of the container more often.
We need to keep in mind that the kinetic energy or Speed of molecules of ideal gases depends on upon temperature and as the temperature increases the Kinetic energy of molecules increases.
So at constant pressure, the rest of the reasons(Options) mentioned can not increase.
Let's take an example of a small area on the surface or wall of the container. earlier when the volume was large, it had a lower probability of being hit by a molecule but now space is small, so it will be hit by more molecules so, high pressure will be generated on this area.
which results in pressure increases.
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using conversions and data in the chapter, determine the number of hydrogen atoms required to obtain 1.0 kg of hydrogen. a hydrogen atom has a mass of 1.0 u.
The number of hydrogen atoms required to obtain 1.0 kg of hydrogen is 6.022 x 10^30.
1 kilogram is equal to 1000 grams and 1 atomic mass unit (u) is defined as one twelfth of the mass of a carbon-12 atom, which is 1.6605 x 10^-27 kg.
So, 1 u = 1.6605 x 10^-27 kg
Therefore, 1.0 kg of hydrogen is equal to 1.0 x 10^3 / 1.6605 x 10^-27 = 6.022 x 10^30 hydrogen atoms.
So, the number of hydrogen atoms required to obtain 1.0 kg of hydrogen is 6.022 x 10^30.
A conversion factor converts one unit to another by utilizing your knowledge of unit relationships. For example, if you know that there are 2.54 centimeters in an inch (or 2.2 pounds in a kilogram or 101.3 kilopascals in an atmosphere), converting between those units becomes simple algebra. It is critical to understand some common temperature, size, and pressure conversions, as well as metric prefixes.
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water parks often include a log rolling area, in which participants try to stay upright while balancing on top of floating logs that are free to rotate in the water. if you've tried this, you know that the larger the diameter of the log, the easier it is to balance on top. (figure 1)
Buoyancy Force is the reason for the larger the diameter as the Larger the diameter larger the volume of log rolling and the higher the Buoyancy force which leads to floating the participants.
The floating of any dogy depends upon the Buoyancy force that the body is having or we can say the force which is applied on the water's surface to float on it. And However, Buoyancy depends on three things.
1. Gravitational pull(g)- the force applied by the planet to pull/attract ant mass towards itself. in the case of the earth, it is fixed which is 9.8 ms^-2.
2. The density(p)- It is the mass per volume of any liquid In the case of distilled water it is 997 kg/m³. It may barry for ocean water.
3. Volumn of the body(v)- It is the volume of the body which is floating on water.
So fb = g*p*v where fb( Buoyancy force) is directly proportional to the volume of the body.
So the Greater the volume of the body higher it will float.
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A train starts from rest and speeds up for 15 minutes until it reaches a constant velocity of 100 miles/hour. It stays at this speed for half an hour. Then it slows down for another 15 minutes until it is still. Which of the following correctly describes the position vs time graph of the train’s journey?
A: The first 15 minutes is a curve that is concave upward, the middle portion is a straight line with slope 100 miles/hour, and the last portion is a concave downward curve.
B: The first 15 minutes is a curve that is concave downward, the middle portion is a straight line with slope 100 miles/hour, and the last portion is a concave upward curve.
C: The first 15 minutes is a curve that is concave upward, the middle portion is a straight line with slope zero, and the last portion is a concave downward curve.
D: The first 15 minutes is a curve that is concave downward, the middle portion is a straight line with slope zero, and the last portion is a concave upward curve.
Answer:
The correct answer is: B: The first 15 minutes is a curve that is concave downward, the middle portion is a straight line with slope 100 miles/hour, and the last portion is a concave upward curve.
Explanation:
The first 15 minutes of the journey, the train is accelerating from rest to reach a constant velocity of 100 miles/hour. The position vs time graph of this portion of the journey would be a curve that is concave downward, as the acceleration is positive and the velocity is increasing.
The middle portion of the journey, the train is moving at a constant velocity of 100 miles/hour. The position vs time graph of this portion of the journey would be a straight line with slope 100 miles/hour, as the velocity is constant.
The last 15 minutes of the journey, the train is slowing down to come to a stop. The position vs time graph of this portion of the journey would be a curve that is concave upward, as the acceleration is negative and the velocity is decreasing.
consider the 0/1/2 knapsack problem. unlike 0/1 knapsack problem which restricts xi to be either 0 or 1, 0/1/2 knapsack problem allows xi to be either 0 or 1 or 2 (that is, we assume that 2 copies of each object i are av
In the 0/1/2 knapsack problem, the objective is to select the set of things that maximises the overall value of the items while staying within the limits of the knapsack. Each item may be selected up to twice.
Similar to the 0/1 knapsack problem, the issue can be written as a linear programming problem and resolved using dynamic programming or the branch and bound approach. The 0/1/2 knapsack problem and the 0/1 knapsack problem are fundamentally different from one another because in the latter, each item may be selected up to twice, but in the former, each item may only be selected once. Accordingly, depending on the particular issue instance, the 0/1/2 knapsack problem is more adaptable and might result in different solutions than the 0/1 knapsack problem. Using a modified version of the conventional 0/1 knapsack method is a common strategy for solving the 0/1/2 knapsack issue.
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a 6kg box is traveling at a speed of 10 m/s. suddenly it comes across a rough patch in the ground, which exerts a friction force of 40 n on the box. how far will the box go before it stops?
The box will go 7.5 meter before it stops.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
Initial speed of the box = 10 m/s.
Final speed of the box = 0 m/s.
Deacceleration of the box = (40 ÷ 6) m/s² = (20/3) m/s²
Hence, distance travelled before it stops = u²/2a
= 10²/(2 ×20/3) m
= (100 × 3)/(2 × 20) m
= 7.5 m.
So, the box will go 7.5 meter before it stops.
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for problems asking for a sketch, be sure to label heights and times. show intermediate steps of your work.
The problems ask to find and plot z[n] = x[2–2n] using [tex]a^{u[n]}[/tex] the function, reconstruct a[n] using linear interpolation and time scaling transformations, and find no and ni such that [n] = p[n+ni) is odd and sketch x[n] for the signal p[n] = u[n+ 7] – u[n+ 3] – u[n + no] + u[n +2].
For the first problem, it is important to make sure that you label the heights and times in the sketch. This is important to ensure that when you are solving the problem, you are paying attention to the different points on the graph and how they interact with one another. To begin with, you can use a combination of transformations to find and plot z[n] = x [2–2n). It is possible to use a transformation like [tex]a^{u[n]}[/tex] where a > 1 to manipulate the x[n] into the desired shape.For the second problem, the signal x[n] and two series of time scaling transformations for x[n] are given below. In order to reconstruct a[n] with each series of transformations, you can use linear interpolation to calculate the interpolated values. You will also need to determine if both series of transformations are invertible or not. To do this, you can inspect the series and see if each transformation is reversible.Finally, for the third problem, in order to find no and nį such that [n] = p[n+ni) is odd, you can start by inspecting the signal p[n] = u[n+ 7] – u[n+ 3] – u[n + no] + u[n +2]. From here, you can then use algebraic manipulation to determine the no and nį. Once these are found, you can sketch x[n], which will be a step function.To learn more about transformations at
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The question is -
For problems asking for a sketch, be sure to label heights and times. Show intermediate steps of your work. 1. Combinations of transformations: Let x[n] = a^u[n], where a > 1, find and plot z[n] = x [2–2n). 2. Example of noninvertible transformations: The signal x[n] and two series of time scaling transformations for x[n] are provided below. Try to reconstruct a[n] with each series of transformations. Are both series of transformations invertible? Use linear interpolation if you need to and write down the general formula for calculating the interpolated values. x[n] n -2 -1 0 1 2 3 4 5 5 x[3n] x/r/3] x[n/3] x[n] x[n] x[n/3] x[3n] x[n] x[n] 3. Even/Odd + Step Function: For the signal p[n] = u[n+ 7] – u[n+ 3] – u[n + no] + u[n +2], find no and nį such that [n] = p[n+ni) is odd and sketch x[n].