A tennis ball undergoes an elastic collision when it hits the ground and bounces up. It is given that the speed of the ball just before it hits the ground is –v0 and immediately after rebounding it is +v0. Which of the statements below is true?
A) The momentum of the ball changes but the momentum of Earth does not.
B) The momentum of the ball changes and the momentum of Earth also changes by the same amount.
C) The momentum of the ball does not change but the momentum of Earth changes.
D) Neither the momentum of the ball nor the momentum of Earth changes.
E) Additional information is needed to answer this question.
B
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A solid object is made of two materials, one material having density of 2000 kg/m3 and the other having density of 8000 kg/m3 . If the object contains equal volumes of the materials, what is its average density?
a. 3000 kg/m3 c. 5000 kg/m3 b. 3200 kg/m3 d. more information is needed
A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
A) 75 N B) 61 N C) 85 N D) 92 N
How would we view time (clocks) on the spaceship as it goes by?
A) Time is the same for everyone. B) Their clocks are going at the same rate as ours. C) Their clocks are going exactly half as fast as ours. D) Their clocks are going faster than ours. E) Their clocks are going slower than ours.
The Paleozoic era ended with an event called the
a. Chicxulub Impact. b. Cambrian Explosion. c. Great Dying. d. Pangaean Rift.