Answer:
Potential Energy
Explanation:
Potential energy is the energy stored in an object due to it's position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
With constant angular acceleration , the disk achieves an angular velocity at time according to
and angular displacement according to
a. So after 1.00 s, having rotated 21.0 rad, it must have undergone an acceleration of
b. Under constant acceleration, the average angular velocity is equivalent to
where and are the final and initial angular velocities, respectively. Then
c. After 1.00 s, the disk has instantaneous angular velocity
d. During the next 1.00 s, the disk will start moving with the angular velocity equal to the one found in part (c). Ignoring the 21.0 rad it had rotated in the first 1.00 s interval, the disk will rotate by angle according to
which would be equal to
They both have exactly the same acceleration.
We can solve the problem by using conservation of energy.
In fact, initially the projectile has only kinetic energy, which is given by
where m is the projectile's mass while
is its initial velocity.
At the point of maximum height, the speed of the projectile is zero, so it only has gravitational potential energy which is equal to
where g is the gravitational acceleration and h is the maximum height of the projectile.
Since the energy must be conserved, we can equalize K and U to find the value of h:
Explanation:
Here, we have four options. We need to fill the blanks to describe the transfer of energy as a ball falls down and bounces back up. The options are as :
- Gravitational potential energy
- elastic potential energy
- kinetic energy
- thermal energy
The ball is dropped and the Gravitational potential energy is converted into kinetic energy as it falls. Gravitational potential energy is associated with the height above ground surface and as the ball comes to ground the potential energy is zero and the is converted to kinetic energy.
When the ball hits the ground and comes to a momentary stop, some of the ball's energy is converted into elastic potential energy as the ball is distorted by the impact.
The impact also transfers thermal energy to the ground. As the ball moves back upwards, kinetic energy is transformed into gravitational potential energy.