А B
С
D
Based on the diagram of a ball rolling down hill, what statement is true?
A)
The ball in box C has less kinetic energy than the ball in box B.
B)
The ball in box A has more kinetic energy than the ball in box B.
The ball in box C has more potential energy than the ball in box B.
D)
The ball in box C has less potential energy than the ball in box B.

The four giant gas points that are made primarily of lightweight elements are

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.