A heavy stone and a light stone are released from rest in such away that they both have the same amount of gravitational potential energy just as they are released. Air resistance is negligibly small
Which of the following statements about these stones are correct? (There could be more than one correct choice.) A) The initial height of the light stone is greater than the initial height of the heavy stone.
B) The stones must have been released from the same height.
C) The stones both have the same speed just as they reach the ground.
D) Just as it reaches the ground, the light stone is traveling faster than the heavy stone.
E) The stones both have the same kinetic energy just as they reach the ground.
A, D, E
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As a balloon high in the atmosphere descends, it undergoes a decrease in
A) volume. B) density. C) weight. D) mass. E) none of the above
Friction: A policeman investigating an accident measures the skid marks left by a car on the horizontal road. He determines that the distance between the point that the driver slammed on the brakes (thereby locking the wheels) and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes?
A. 10.7 m/s B. 12.8 m/s C. 21.4 m/s D. 32.9 m/s E. 45.7 m/s
The superposition of two waves, 
and 
,results in a wave with a frequency of
A. 85 Hz. B. 170 Hz. C. 85? Hz. D. 340 Hz. E. 170? Hz.
A foul ball is hit straight up into the air with a speed of 30.0 m/s. (a) Calculate the time required for the ball to rise to its maximum height. (b) Calculate the maximum height reached by the ball
(c) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball. (d) Explain why there are two answers to part (c).