<h2>None of these forces contribute for these vibrations </h2>
Explanation:
The atoms or molecules of the solid substance vibrate at zero degree absolute even , due to kinetic energy of the constituent atoms or molecules .
According to Kelvin , the kinetic energy of these particles should become zero at absolute zero .
But it is found by actual calculations that the kinetic energy of constituent atoms or molecules does not become zero .
Thus all the above forces are not considered as the main cause of these vibration .
Answer:
Consider the velocity-time graph attached below.
The velocity-time graph represents the acceleration of a body under a force.
We can see that is the graph that if a child release the ball above the ground at A, it hits the ground at B. Bounces back with a reaches the top again at C, and hits the ground again at D.
The slope of velocity time graph represents acceleration. From A to B, velocity in increasing constantly with respect to time, which means constant acceleration from A to B. AS velocity increase, momentum of the ball also increases, which results in the increase of Kinetic energy.
At B, the ball hits the ground, the velocity decreases, momentum decrease s, because kinetic energy is transferred from the ball to the ground, due to which the ball would not attain the same height after the bounce.
Then the velocity remains negative at C, which means that now the ball is moving in opposite direction till C. It reaches its new at height at C, which is not the same as that of A because of lost in Kinetic Energy, and fall again.
It could have bounced off of something or another kid could have kicked it back.
Answer:
2 m/s²
Explanation:
If changes speed by 2 meters per second each second means:
2 m/s²
Because it changes constantly it veloctity.
Remember the aceleration changes the velocity.
A good hypothesis describes your ideas and how you think the experiment will conclude. Additionally, hypotheses have scientific information included.