What a noncrystalline solid
A
1. Runners A, B, and C are running a race. Based on their locations, which 20 points
runner is experiencing acceleration?
Answer:
B) 48 metres
Explanation:
Which two factors are used to calculate kinetic energy?
A The chemical formula for the object
B. The velocity of an object
c. The mass of an object
D. The height of an object
E . The density of an object
Answer:
B. The velocity of an object
c. The mass of an object
Explanation:
MARKING BRAINLIEST
sports car accelerates from rest to 26.8 m/s (roughly 60 mi/h) in 5.1 seconds. What is the acceleration of the car?
One minute after takeoff, a rocket carrying the space shuttle into outer space reaches a speed of 447 m/s. What was the average acceleration of the rocket during that initial minute?
Answer:
5.3m/[tex]s^{2}[/tex]; 7.45m/[tex]s^{2}[/tex]
Explanation:
the magnitude of a=(change in speed)/(the time took to accelerate to the speed above)
So for that sports car, a=(26.8m/s-0m/s)/(5.1s)=5.2549m/[tex]s^{2}[/tex], knowing from the question that the sig fig of this question depend on "5.1 seconds", so the answer should be 5.3 m/[tex]s^{2}[/tex]
For the rocket, a=(447m/s-0m/s)/(1 minute)=(447m/s)/(60s)=7.45m/[tex]s^{2}[/tex]
ASAP
What instrument(s) is used to measure humidity?
Group of answer choices
A. hygrometer
B. anemometer
C. sling psychrometer
D. barometer
Answer:
Sling Psychrometer
Explanation:
A sling psychrometer measures relative humidity through the process of evaporation. It contains two thermometers. The cloth around one of the thermometers is wetted and slung around in the air so the moisture evaporates, which has a cooling effect. The relative humidity is then calculated using the difference in temperature for the two thermometers.
A closed system consists of a pendulum that is swinging back and forth. If
the pendulum's kinetic energy decreases, what else must happen to the
energy of the system?
a
A. Its gravitational potential energy must decrease.
B. Its total mechanical energy must increase.
O C. Its total mechanical energy must decrease.
O D. Its gravitational potential energy must increase.
Answer:
The correct choice is D. Its gravitational potential energy must increase
Explanation:
Conservation of Mechanical Energy
The total amount of mechanical energy, in a closed system in the absence of dissipative forces like friction or air resistance, remains constant.
This means that energy cannot disappear or appear and that potential energy can become kinetic energy or vice versa.
In a closed system like a pendulum, two types of energies are considered: Gravitational potential (U) and kinetic (K). Thus, the sum of both energies must remain constant in time.
Suppose the pendulum is at a state where U=150 J, and K=350 J. The total mechanical energy is:
M = 150 J + 350 J = 500 J
If the kinetic energy decreases to a new value, say K = 200 J, then the gravitational potential must increase to compensate for this new condition, that is: U = 300 J
The correct choice is D. Its gravitational potential energy must increase
Taking into account the definition of kinetic, potencial and mechanical energy, the correct answer is option D: If the pendulum's kinetic energy decreases Its gravitational potential energy must increase.
Kinetic energyKinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
Potential energyOn the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.
Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.
Mechanical energyFinally, mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. Then:
Potential energy + kinetic energy = total mechanical energy
The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)
Therefore, if the potential energy decreases, the kinetic energy will increase. In the same way, if the kinetics decreases, the potential energy will increase.
This caseThis principle can be applied in this case. The mechanical energy of the pendulum remains constant when all the forces acting on it are conservative.
So, the correct answer is option D: If the pendulum's kinetic energy decreases Its gravitational potential energy must increase.
Learn more about mechanical energy:
https://brainly.com/question/17809741?referrer=searchResultshttps://brainly.com/question/14567080?referrer=searchResultshttps://brainly.com/question/12784057?referrer=searchResultshttps://brainly.com/question/10188030?referrer=searchResultshttps://brainly.com/question/11962904?referrer=searchResultsIf you force the magnitude of the vector to stay the same, but increase the vertical component value, what happens to the horizontal component of the vector?
Answer:
The horizontal component reduces
Explanation:
The magnitude of a vector is found by taking the root of the sum of the squares of the components of the vector
Therefore, when the values of one of the components is increased, while the other components of the vector stay the same, the magnitude of the vector increases
In order to increase the value of one of the components of a vector and maintain the magnitude of the vector, the values of one or more of the other components must be reduced.
As such when the magnitude of the vector that has only a vertical and a horizontal component is forced to stay the same, and the vertical component is increased, the horizontal component must be reduced.
The increase in vertical component of the vector, causes a decrease in the horizontal component of the vector.
A vector can be represented in vertical and horizontal components.
[tex]V = V_x + V_y[/tex]
where;
[tex]V_x[/tex] is the horizontal component of the vector[tex]V_y[/tex] is the vertical component of the vector[tex]V = Vsin(\theta) \ + Vcos(90-\theta)[/tex]
From the formula above, as one component vector increases, the other component reduces.
Thus, the increase in vertical component of the vector, causes a decrease in the horizontal component of the vector.
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Students raced each other in the gym while the teacher recorded each student's speed. Jeremy ran 14 miles per hour, Isaiah ran 10 miles per hour, Jonah ran 13 miles per hour, and Alexis ran 16 miles per hour. Which of the bar graphs should the teacher use to compare the students' speeds? (pictures re the choices)
In a gym the students raced with each other and teacher is recording everyone's speed than the second graph is representing correctly.
What is a graph?A graph is a visual depiction of statistical data or a logical relationship between variables. Graphs serve a predictive purpose because they have the virtue of displaying broad trends in the mathematical behavior of data. However, as just approximations, they may be incorrect and occasionally deceptive.
Most graphs have two axes, with the axis denoting a set of independent variables and the vertical axis denoting a set of dependent variables. The most typical graph is indeed a broken-line chart, where the regression coefficient is typically a factor of duration.
In the second graph the speed of every student is represented accurately, therefore the second graph is correct.
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In a game of tug-of-war, a rope is pulled to the left with a force of 75 N and to the right with a force of 100 N. What is the magnitude and direction of the net external force on the rope?
Answer:
25 N to the Right
PLEASE HELPP
Select the correct answer.
Which item is made from a synthetic material?
cotton pants
leather jacket
tissue paper
wicker basket
Answer:
Tissue paper
Explanation:
Tissue paper is made from a synthetic material
Which rule(s) is used for combining velocities?
A. Scalar rules
B. Vector rules
C. Equilibrium rule
Answer: B. Vector rules
Explanation:
To solve this we must be knowing each and every concept related to velocity. Therefore, the correct option is option B among all the given options.
What is velocity?Velocity refers to a vector assessment of an object's rate of motion and direction of motion. As a result, in order to calculate velocity using this definition, we must be familiar with both magnitude and direction.
It determines how quickly or slowly something moves. Consider the following scenario: two moving objects. If both items are going in the same direction, it is simple to determine which one is moving faster. However, judging which item is quicker is difficult when they are traveling in different directions. Vector rules is used for combining velocities.
Therefore, the correct option is option B among all the given options. Vector rules is used for combining velocities.
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For all my breakdancers out there can you please tell me how to do a second windmill I can get one but I’m stuck there
Answer:
Explanation: To breakdance, ask a friend or a professional, surf the internet, or invent your own moves. You don't have to master other breakdancers' moves to be a breakdancer yourself. You breakdancing by ...
Breaking is a result of friction between the brake linings and your foot.
A. True
B. False
im talking about this qeastion
Answer:
a. Winter.
Explanation:
Answer:
Winter
Explanation:
2. True or false. As a wave travels through a given material its velocity changes.
Answer:
the answer is false
Explanation:
A wave travels at a constant velocity through a given material.
In a powder-flavored drink solution, which substance is the solvent?
a. glass
b. flavored powder
c. water
d. sugar
Answer:
c. Water
Explanation:
The solvent is the substance in which a solute is dissolved to make the solution.
In this case, the water is the solvent, the flavored powder is the solute, and the solution is the final drink.
Define the amplitude of a wave
Answer:
amplitude of a wave is the maximum displacement of a particle from its rest position
please help me with these two questions
Answer:
The kinetic energy would decrease because it has less mass
Explanation:
A battery
HELP PLEASE
A cyclist and his bicycle have a combined mass of 88 kg and
a combined weight of 862.4 N. The cyclist accelerates at 1.2
m/s2. After 2 seconds he reaches a speed of 2.4 m/s. What is
his momentum at this point?
A. 359.3 kg.m/s
B. 105.6 kg.m/s
C. 211.2 kg-m/s
O D. 36.7 kg-m/s
The momentum of the cyclist and bicycle at this point is 211.2 kg·m/s, calculated by multiplying their combined mass (88 kg) by their velocity (2.4 m/s). The correct answer is C.
The momentum of an object is defined as the product of its mass and velocity. To find the momentum of the cyclist at this point, we can use the equation: momentum = mass × velocityFirst, let's find the mass of the cyclist and his bicycle. We are given that their combined mass is 88 kg. Next, we need to find the velocity of the cyclist. We are given that he reaches a speed of 2.4 m/s after 2 seconds, and that he accelerates at a rate of 1.2 m/s². We can use the equation of motion: velocity = initial velocity + acceleration × timeThe initial velocity is 0 m/s (since the cyclist starts from rest), the acceleration is 1.2 m/s², and the time is 2 seconds. Substituting these values into the equation, we get:For more questions on momentum
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How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is greater after a substance changes from a
plasma to a gas.
B. The kinetic energy is less after a substance changes from a liquid
to a solid
C. The kinetic energy is greater after a substance changes from a
gas to a plasma.
D. The kinetic energy is less after a substance changes from a liquid
to a gas.
HELLPPPPPPP
Answer:
it is C. The kinetic energy is greater after a substance changes from a
gas to a plasma.
Explanation: The higher the temperature the higher the kinetic energy
pls vote for me
what is the skydivers acceleration
A plane drops C.A.R.E package to some needy people in the jungle from a height of 1,000 meters.How long will it take the package to strike the ground?
Make a motion chart for a cannonball launched with an initial speed of 20m/s. Neglect drag and the initial height of the cannonball. After the ball lands on the ground enter zero for all speeds and heights if necessary. Use regular metric units (ie. Meters).
Answer:
The speed and height at 0 sec are 20 m/s and 0 m.
The speed and height at 1 sec are 10.2 m/s and 15.1 m.
The speed and height at 2 sec are 0.4 m/s and 20.4 m.
The speed and height at 3 sec are 9.4 m/s and 15.9 m.
The speed and height at 4 sec are 19.2 m/s and 1.6 m.
Explanation:
Given that,
Initial speed = 20 m/s
Suppose, given time in charge are t= 0, 1, 2, 3, 4 sec
At t=0 sec,
We need to calculate the velocity and height
Using equation of motion
[tex]v=u-gt[/tex]
Put the value into the formula
[tex]v=20-9.8\times0[/tex]
[tex]v=20\ m/s[/tex]
Now, using second equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]h=20\times 0-\dfrac{1}{2}\times9.8\times0[/tex]
[tex]h=0\ m[/tex]
At t=1 sec,
We need to calculate the velocity and height
Using equation of motion
[tex]v=u-gt[/tex]
Put the value into the formula
[tex]v=20-9.8\times1[/tex]
[tex]v=10.2\ m/s[/tex]
Now, using second equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]h=20\times1-\dfrac{1}{2}\times9.8\times1^2[/tex]
[tex]h=15.1\ m[/tex]
At t=2 sec,
We need to calculate the velocity and height
Using equation of motion
[tex]v=u-gt[/tex]
Put the value into the formula
[tex]v=20-9.8\times2[/tex]
[tex]v=0.4\ m/s[/tex]
Now, using second equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]h=20\times2-\dfrac{1}{2}\times9.8\times2^2[/tex]
[tex]h=20.4\ m[/tex]
At t=3 sec,
We need to calculate the velocity and height
Using equation of motion
[tex]v=u-gt[/tex]
Put the value into the formula
[tex]v=20-9.8\times3[/tex]
[tex]v=-9.4\ m/s[/tex]
Negative sign shows the opposite direction of motion
Now, using second equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]h=20\times3-\dfrac{1}{2}\times9.8\times3^2[/tex]
[tex]h=15.9\ m[/tex]
At t=4 sec
We need to calculate the velocity and height
Using equation of motion
[tex]v=u-gt[/tex]
Put the value into th formula
[tex]v=20-9.8\times4[/tex]
[tex]v=-19.2\ m/s[/tex]
Negative sign shows the opposite direction of motion
Now, using second equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]h=20\times4-\dfrac{1}{2}\times9.8\times4^2[/tex]
[tex]h=1.6\ m[/tex]
So, The ball has hit the ground at 5 sec.
Hence, The speed and height at 0 sec are 20 m/s and 0 m.
The speed and height at 1 sec are 10.2 m/s and 15.1 m.
The speed and height at 2 sec are 0.4 m/s and 20.4 m.
The speed and height at 3 sec are 9.4 m/s and 15.9 m.
The speed and height at 4 sec are 19.2 m/s and 1.6 m.
PLZ HELP!!!
Which group benefits most from information being transmitted by electromagnetic waves over cable networks?
A. People who use radios to listen to music
B. People who live far from a transmitting antenna
C. People who live close to cell phone base stations
D. People who have easy access to Wi-Fi
The group benefits that transmitted by electromagnetic waves over cable networks should be option C.
What are electromagnetic waves?It is the waves that are developed since a result of vibrations lies between an electric field and a magnetic field. It is comprised of oscillating magnetic and electric fields. Here the waves should be transmitted over the cable networks should be benefited when the people live close to their cell phones.
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Answer:
Its People who live far from a transmitting antenna
Explanation: I did the quiz
Student is attempting to hit a target 4 meters from the edge of the desk that is 1.4 m tall marble rules of a table horizontally as shown below according to the above information in diagram what velocity must a marble have to strike the target?
Answer:
The correct option is;
7.49 m/s
Explanation:
The time it takes the marble to fall vertically is given by the equation
s = u·t + 1/2·g·t²
Where;
s = The height of the table = 1.4 m
u = The initial vertical velocity = 0 (The marble is given only an initial horizontal push (velocity))
g = The acceleration due to gravity = 9.81 m/s²
t = The time it takes the marble to reach the ground 1.4 m below
Plugging in the values. gives;
1.4 = 0×t + 1/2 × 9.81 × t²
∴ t² = 1.4/(1/2 × 9.81) ≈ 0.28542 s²
t = √0.28542 ≈ 0.5342s
The horizontal range the marble is to cover in the approximately 1.87 seconds before it reaches the ground = 4 meters
Therefore, the velocity that allows the marble to reach 4 meters in 1.87 seconds is give as follows;
Velocity = Distance/Time = 4 m/(0.5342 s) ≈ 7.49 m/s
Therefore the horizontal velocity the marble must have to strike its target is approximately 7.49 m/s.
16 William is sliding down a plastic slide on a playground. After he slides down the
ground, he feels a small electric shock when he touches a piece of metal. What has been built up on his body
that causes the shock?
A atoms
B electrons
C. neutrons
D. protons
Answer:Electrones
Explanation:Because its building up static
Answer:
B) Electrons
Explanation:
When William slides down the slide, the rubbing action between William and the slide causes electrons to be transferred to William and stored as a negative charge.
When he touches a piece of metal, the negative charge (i.e the build up of excess electrons), is released (discharged) into the metal causing what we know as a static shock.
Which of the following represents a chemical change? (1 point)
Answer:
D
Explanation:
Splitting water into hydrogen and oxygen***
Which of the following offers guidance to individuals in various situations of conflict, confusion and crisis by means of providing tools necessary for self-development?
Answer:
confusion
Explanation:
mark as brainlist plz
When a force of 34 N accelerates the object 4 m/s^2?
Answer:
br
Explanation:frbecause u dumb
Sarah is asked to sort out the list of ions and ionic compounds. How can Sarah differentiate between the ions and ionic compounds? Ions have a positive or negative charge, but an ionic compound's overall charge is zero. Ions have no charge, but ionic compounds have a positive charge. Ions have no charge, but ionic compounds have a negative charge. Ions have a positive or negative charge, but an ionic compound's overall charge is negative.
Answer:
Ions have a positive or negative charge, but an ionic compound's overall charge is zero.
Explanation:
Ionic compounds are compounds said to contain ions, which are atoms that have either lost electrons to be POSITIVELY CHARGED or gained electrons to be NEGATIVELY CHARGED. The negatively charged ions are called ANIONS while the positively charged ions are called CATIONS.
These cations (+ ions) and anions (- ions) make up ionic compounds in such a way that they give the ionic compound a net charge of ZERO. This is because the charges of the opposite ions that make up the ionic conpound are equal. For example, in the ionic compound CaCl2;
Ca is a cation with charge +2
Cl is an anion with charge -1, 2 atoms make a net charge of -2
When these two ions combine, they cancel out each other to form an ionic compound, CaCl2, with net charge 0 or neutral
Answer:
The answer is
A. Ions have a positive or negative charge, but an ionic compound's overall charge is zero
i got it right on edge 2023
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