An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same amount and type of water, the same perking time, and the same electrical sources were used. What is a constant?

Based on the data in the chart, it can be concluded that as mass increases, so does thermal energy, because the thermal energy of a substance is highly dependent on its temperature and mass.

Thermal energy always moves from a higher temperature area to a lower temperature area. When a block of ice comes into contact with a colder substance, such as liquid nitrogen or dry ice, thermal energy moves from the ice to the colder substance.

Because mass measures the amount of material in a sample, thermal energy is determined by the mass and temperature of the object. The more significant the mass of the object, the more particles there are in the model, and the more significant the thermal energy.

Thermal energy is the energy contained in the motion and vibration of its molecules.

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The resistance of a wire with a 1.6 mm diameter and 20 m length made of the same material is 3.14×10⁻⁷Ω−m.

Electrical resistance of a conductor with a unit cross-sectional area and unit length is called resistivity. Resistivity is a distinctive attribute of any material that may be used to compare different materials based on how well they conduct electric currents. Low conductivity is indicated by high resistance.

Given,

l= 10m= 1000mm

d= 2mm

∴radius(r)= 20.2 =0.1mm

R=10Ω

To find,

Resistivity(ρ)

ρ=R /l A

​where,

R= Resistance

l= Length of wire

A= Cross sectional area of wire

Cross sectional area of cylinder (A)=Πr²

A= π×(0.1)²

A=0.0314mm²

ρ=10(10000.0341)

ρ=0.000314Ω−mm

ρ≃3.14×10⁻⁷Ω−m

So, the resistivity of the material is equal to 3.14×10⁻⁷Ω−m.

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Answer:

a black or dark viscous substance obtained as a residue in the distillation of organic materials and especially tars

Explanation:

The rolling resistance of the road is 203.02lb per ton

R=P/W where W=47877lb/(2000lb/ton)=23.985 ton

R=4860lb/23.985ton

R=203.02lb per ton.

Rolling resistance, occasionally known as rolling friction or rolling drag, is the pressure resisting the movement when a frame rolls on a surface. Its miles are mainly caused by non-elastic consequences; that is, no longer all of the energy needed for deformation of the wheel, roadbed, and so on., is recovered when the stress is removed.

Tire rolling resistance is the power that your vehicle needs to send to your tires to hold movement at a steady velocity over a surface. In other words, it is the effort required to maintain a tire rolling. the principal contributor to rolling resistance is the process known as hysteresis.

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ANSWER:

B. red giant

STEP-BY-STEP EXPLANATION:

The Sun is currently a main sequence star and will remain so for another 5 billion years. It will then expand and cool down to become a red giant, after which it will contract and heat up again to become a white dwarf.

Therefore, the correct answer is: B. red giant

Answer: 1h

Explanation:

The angular distance should be

In revolution, θ = 11.53 revolution.

In radian = θ = 72.40 rad.

In degree θ = 4150.8°.

Calculation of the angular distance:

Since

Pie diameter = 8.50 in

So,  the circumference of the pie should be

P = πd = 8.50π in

And, rim of the pie rotates 308 in,

So,

1 Revolution of the pie is 8.50π in,

So, for 308 it should be

= 308 in / 8.50π in revolution

=11.53 revolution

Now in the case when when we have to find distance in radians:

1 revolution is 2πrad

So,

11.53 revolution = 11.53 × 2π = 72.40 rad.

And also, 1 revolution is 360°

So,

11.53 revolution = 11.53 × 360 = 4150.8°

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A student learns that a certain comet in the solar system is considered a short-period comet. Based on this knowledge, the student most justified in concluding The comet originates between the Sun and the asteroid belt.

The Solar System's asteroid belt is a torus-shaped area roughly midway between the orbits of Jupiter and Mars. Asteroids or minor planets are the names for the vast majority of solid, irregularly shaped entities that are far smaller than planets. The term "primary asteroid belt" also applies to this asteroid belt.

A comet is a tiny, frozen object in the Solar System that begins to outgas when it approaches the Sun. Outgassing is the process through which gases are released from the comet.

The orbital durations of comets differ widely, from a few years to possibly millions of years, and they often have very eccentric elliptical orbits. The Kuiper belt or its related scattered disc is the source of short-period comets.

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Answer:

I would use physical properties to identify each substance because anything with the same physical properties as previous substances in the past.

Explanation:

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The propagation delay of the link due to time dilatationis 1.152 x 10¹⁶ s.

We need to know about the time dilatation to solve this problem. Time dilatation represents that time is relative between the moving and static objects.  From a static objects point of view, the time should be

t' = t / √(1 - v²/c²)

where t' is the interval time based on the static object, t is the interval time based on the moving object, v is velocity and c is the speed of light (3 x 10⁸ m/s),

From the question above, the given parameters are

v = 2.4 x 10⁸ m/s

D = 3.6 x 10⁷ m

Find the time taken based on moving objects

t = 2D . v

t = 2 . 3.6 x 10⁷ . 2.4 x 10⁸

t = 1.728 x 10¹⁶ s

Find the time interval based on static objects

t' = t / √(1 - v²/c²)

t' = 1.728 x 10¹⁶ / √(1 - (2.4 x 10⁸)²/(3 x 10⁸)²)

t' = 2.88 x 10¹⁶ s

Hence, the delay time is

Δt = t' - t

Δt = 2.88 x 10¹⁶ - 1.728 x 10¹⁶

Δt = 1.152 x 10¹⁶ s

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The distance travelled due east during the trip is 875.831 meters.

The distance due west is 6.44 km (6440m) and the velocity due west is 2.6m/s. The velocity due east is 0.465m/s.

We know,

Average velocity = Total displacement/Total time

It is given that, the total average velocity is 0.465m/s.

If distance in west is W and the distance in east is E, then the displacement D is,

D = √((6440)²+(E)²)

The time T₁ in west,

T₁ = 6440/2.6 seconds

Time time T₂ in east,

T₂ = E/0.465

The total time T is,

T = T₁ + T₂

T = 6440/2.6 + E/0.465

So, putting all the values now,

Average velocity = D/T

1.37 = √((6440)²+(E)²)/(6440/2.6 + E/0.465)

On solving it further,

We get,

E = 875.831 meters.

So, the distance in east is 875.831 meters.

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Given, Speed of the sound, v=675 m/s

The wavelength of the wave, λ=15 m

Relation between speed, wavelength, and frequency of a wave is given by

Where f is the frequency of the sound.

On substituting the known values,

Which gives us,

Therefore the frequency of the sound in the given medium is 45 Hz.

The water molecules in the gas phase have more kinetic energy than in the liquid phase. The molecules in the liquid phase must absorb energy from the surroundings to enter the gas phase.

A hot spring can be defined as a natural or an artificially-induced phenomena in which very hot groundwater flows out from the Earth's crust due to the heat energy that is present in the geosphere.  

A phase change simply refers to the change in the state (phase) of matter of a given chemical compound or substance in the following ways:

Generally speaking, the water molecules in the gas phase typically possesses more kinetic energy than in the liquid phase and as such, it would have to absorb more energy from the surroundings in order to enter the gas phase.

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If the second player moved horizontally, the speed he must maintain to catch the ball is 27.67 m/s.

The range of the projectile is the maximum horizontal distance travelled by the ball.

R = (u²sin(2θ)) / (g)

where;

R = (32² x sin(2 x 30) ) / (9.8)

R = 90.49 m

The time of motion of the ball is calculated as follows;

R = uₓt

where;

R = ucosθ(t)

t = R/ucosθ

t = (90.49) / (32 cos30)

t = 3.27 seconds

If the second player moved horizontally, the speed he must maintain to catch the ball is calculated as;

R = Ut

U = R/t

U = (90.49) / (3.27)

U = 27.67 m/s

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According to the research, the correct option is true. The statement "Pushing or pulling an object that is not already moving can make that object start to move" is true.

It is about the change of position starting from a reference system from which it is observed that an object experiences.

In this sense, it is related to the displacement of a body and is produced by an imbalance between the forces that act on it, that is, the application of a force modifies the state of rest or the direction of movement.

Therefore, we can conclude that motion is the state of bodies when they change position caused by an effect acting on the bodies called force.

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The kinetic energy of each of the following objects compare to one another as: II > I > III

As we know the kinetic energy is follows as:

K.E. = 1/2m[tex]v^{2}[/tex]

(i) Object 1

mass = 3kg

velocity = 4m/s

K.E. = 1/2m[tex]v^{2}[/tex]

K.E. = 1/2×3×4×4

K.E. = 24J

(ii) Object 2

mass = 1kg

velocity = 8m/s

K.E. = 1/2m[tex]v^{2}[/tex]

K.E. = 1/2×1×8×8

K.E. = 32J

(iii) Object 3

mass = 3kg

velocity = -3m/s

K.E. = 1/2m[tex]v^{2}[/tex]

K.E. = 1/2×3×(-3)×(-3)

K.E. = 13.5J

Therefore, the kinetic energy of each of the following objects compare to one another as: II > I > III

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It is best to choose option B. When a star runs out of fuel, it can no longer undergo the merger process and dies. The primary elements of stars are helium and hydrogen.

A white dwarf star's maximum mass is determined by Chandrasekhar's limit, a sort of maximum restricted value. The Chandrasekhar limit is often valued at 1.44 times the mass of the sun, or around 2.765 1030 kg, on a global scale.

In other words, the Chandrasekhar limit is the highest figure that may possibly reach 1.44 times the mass of the sun.

When a high-mass star runs out of gas to burn, it enlarges and changes into a red supergiant. While the bulk of stars gradually fade away, the supergiant stars, often known as supernovae, demolish themselves in a massive explosion. New stars can develop as a result of massive stellar deaths.

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The substance added to gasoline and found in the wells of people who live miles from a gas station is an example of non-point source of pollution.

Point source pollution are sources of pollution, radiation, waves, fluid or other substance that has one specific location.

On the other hand, non-point source pollution is a combination of pollutants from a large area rather than from specific identifiable sources such as discharge pipes.

According to this question, a substance added to gasoline is found in the wells of people who live miles from a gas station. This suggests that the pollutants enter from a wide array of sources.

Therefore, it can be said that the source of pollution is a non-point source.

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The temperature of the Earth is determined by the amount of solar radiation received, the amount of solar energy reflected, and the amount of heat retained by the atmosphere.

What is temperature?
The physical concept of temperature expresses in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined various reference points as well as thermometric substances. The most popular scales are the Celsius scale, also known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), as well as the Kelvin scale (K), with the latter being primarily used for scientific purposes. One of the International System of Units' seven base units is the Kelvin (SI).

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The forces have a same magnitude, act in opposing directions, and result in a net force of zero. The forces produce a net force in the direction of motion that is in the same direction, but they are not equal in size.

All forces operating on an automobile travelling uniformly at a steady speed are balanced. In this instance, the two opposing forces air resistance and friction perfectly balance the force that the wheels are exerting on the ground. However, the instant your foot leaves the gas pedal, there is no longer an applied force, and the forces are out of balance: Now when the car is out of balance, the forces pushing backward on it cause it to slow down; this is known as negative acceleration.

Because there wasn't enough upward force (i.e., regular force from the chair) to balance the extra mass, you would speed downward as a result of the unbalanced force, possibly breaking your tailbone as you plunged through the chair to the floor.

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In between the two processes, we can see that the thermal energy of the mixture increases.

Recall that energy is the ability to do work. Now when we add the  partially melted to form a mixture of ice and ice water, we are going to increase the thermal energy of the water. This is because the water in the liquid state has a greater energy than water in the solid state.

Having see that liquid water contains more energetic particles than the the solid water, the thermal energy has increased in between the two processes.

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Option D is correct. In venturi meter a converging section of a pipe is used to increase the flow velocity and corresponding pressure drop, from which the fluid flow rate is calculated using Bernoulli's equation.

A venturimeter is a flow measurement device. The meter is connected between two sections of the pipe; the cross-sectional area A of the meter's entrance and exit corresponds to the cross-sectional area of the pipe. The fluid flows from the pipe with speed V between the entrance and exit, and then through a narrow throat with cross-sectional area a with speed v. A venturi works by measuring the difference in pressure between two points. The pressure difference is created by narrowing the pipe, causing the fluid to flow faster. In the larger section of the venturi, the fast moving fluid has a lower pressure than the slower fluid.

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Gravitational constant to be G = 6.67×10−11 N⋅m2/kg2 , the mass of the earth to be me = 5.97×1024 kg , and the radius of the Earth to be re = 6.38×106 m then Gravitational force Fgrav on the satellite is 19383.7 N

Given value for constant Gravitational G = 6.67 x 10-11 N.m²/kg²

Earth mass is M = 5.97 x 1024

Mass of the satellite  m = 2440

Earth's radius  RE = 6.38 x 106 m

Height of the satellite from the surface of the Earth = H = 700 km = 700 x 103 m = 0.7 x 106 m

Radius of the satellite = R

R = RE + H

R = 6.38x106 + 0.7x106

R = 7.08 x 106 m

Gravitational force of Earth on the satellite = Fg

F, GMm R2

F,= (6.67 * 10-11)(5.97* 104) (2440) (7.08 * 106)2

Fg = 19383.7 N

Free-fall acceleration at the surface of the Earth = g = 9.8 m/s2

Weight of the satellite at the surface of the Earth = W

W = mg

W = (2440)(9.8)

W = 23912 N

Ratio of the gravitational force on the satellite to it's weight on the surface = P

P = Fg/W

p= 19383/23912

P = 0.8106

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If I had access to a personal DNA machine, I would analyze my ancestry and my health condition.

Just for curiosity you can compare your DNA to your parents DNA to find whose trait you received the most. Through DNA testing one can find where their ancestors lived and which group of people they interacted with.

In terms of analyzing DNA for health condition one can identify if they have any genetic diseases and it can also be used to identify cancer in its early stages so that it can be cured. It can also be used to identify the diseases an unborn fetus might inherit.

Therefore, if I had access to a personal DNA machine, I would analyze my ancestry and my health condition.

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The correct option is b. The one with the lowest mass.

An object's kinetic energy is determined by

k=1/2mv^2

where

m is the object's mass.

v is the object's speed.

The three missiles in this puzzle have varying masses but the same beginning kinetic energy.

The three projectiles will all have the same kinetic energy when they hit the ground because mechanical energy is conserved, assuming there is no air resistance (because the potential energy that they have lost is the same, since they have been launched from the same height, and they reach the same final altitude, the ground).

hence,

K1=k2=k3

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According to the given statement is the train’s velocity after 14s is -7.5 m/s.

The path of a body or entity's movement is determined by its velocity. In its basic form, velocity is a scalar quantity. In definition, velocity is a vector quantity. It is the speed where at ’s dimensional. It is the migration change rate.

Initial velocity of the train, u = -4.0 m/s

Acceleration of the train, a = -0.25 m/s²

Time of motion of the train, t = 14 s

The following formula is used to determine the train's final speed:

v = u + at

v is the final velocity of the train

v = -4.0 + (-0.25 x 14)

v = -4.0 - 3.5

v = -7.5 m/s

Therefore, the train velocity of the train is -7.5 m/s.

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Based on the principle of momentum, the momentum of the egg falling from a cliff and which shatters on hitting the ground is conserved.

Momentum is the product of the mass and the velocity of a compound.

Momentum, p = mass * velocity

Momentum is a vector quantity and its unit is kgm/s.

According to the principle of the conservation of momentum, in a system of colliding bodies, the momentum before the collision and the momentum after collision is conserved or equal.

Therefore, the momentum of the egg in the given scenario is conserved.

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The average acceleration for that time interval will be zero because the velocity is constant.

If an object's velocity changes, it is said to have been accelerated. An object's velocity can alter depending on whether it moves faster or slower or in a different direction. A falling apple, the moon orbiting the earth, and a car stopped at a stop sign are a few instances of acceleration. Through these illustrations, we can see that acceleration happens whenever a moving object changes its direction or speed, or both.

Velocity and speed describe how quickly or slowly an object is moving. We frequently encounter circumstances when we must determine which of two or more moving objects is going faster. If the two are travelling on the same route in the same direction, it is simple to determine which is quicker. It is challenging to identify who is moving the fastest when their motion is in the other direction. The concept of velocity is useful in these circumstances. Learn about the definition of velocity in this article as well as the distinction between speed and velocity.

the velocity is constant at -20 m/s. Hence the average acceleration for that time interval will be zero because the velocity is constant.

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Answer:

0

Explanation:

i did it on khan academy

When a ladder with 20 ft. long is pulled along the floor away with a constant rate 1.2 ft/s, then the top of the ladder is moving toward the floor with velocity - 0.9 ft/s and there is no acceleration.

Let:

x = the distance between the bottom of the ladder from the wall

y =  the distance between the top of the ladder from the floor

When x = 12 ft, then using the Pythagorean Theorem:

x² + y² = 20²    (Equation 1)

12² + y² = 20²

y² = 20² - 12² = 16²

y = 16 ft.

Take the derivative of equation 1 with respect to t

2x . dx/dt + 2y. dy/dt = 0

Substitute x = 12, y = 16, dx/dt = 1.2 ft/s

2 . 12 . (1.2) + 2 . 16 . dy/dt = 0

dy/dt = - 0.9 ft/s

Hence, the velocity is - 0.9 ft/s

Since the floor is moving with a constant rate, the acceleration is zero.

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