Whenever the net force on an object is zero, its acceleration
A) may be zero.
B) is zero.
C) and velocity are the same.
D) none of the above
Answer: B
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How does the density of copper at its melting point of 1356 K compare to that of copper at room temperature, 293 K? Its linear expansion coefficient is 
A. 1.054 times as large B. 1.018 times as large C. 0.946 times as large D. 0.982 times as large E. 0.947 times as large
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Answer the following statement true (T) or false (F)
Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in a partially inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit?
a. The ball was moving faster before it was hit. b. The ball was moving faster after it was hit. c. The ball was moving at essentially the same speed before and after the hit. d. There is insufficient information to answer this problem.