During a collision, which of these is an indication that the total momentum has changed?
A. Heat is generated, deformation occurs, and sound is produced
B. Deformation occurs
C. Sound is produced
D. Heat is generated
E. None of these choices are correct
Answer: E
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Which of the following type of electromagnetic radiation has the highest energy?
A) radio B) infrared C) visible D) ultraviolet E) X-ray
A block is supported on a compressed spring, which projects the block straight up in the air at velocity 
. The spring and ledge it sits on then retract. You can win a prize by hitting the block with a ball. When should you throw the ball and in what direction to be sure the ball hits the block? (Assume the ball can reach the block before the block reaches the ground and that the ball is thrown from a height equal to the release position of the block.)
A. At the instant when the block leaves the spring, directed at the block B. At the instant when the block leaves the spring, directed at the spring C. At the instant when the block is at the highest point, directed at the block D. At the instant when the block is at the highest point, directed at the spring E. When the block is back at the spring's original position, directed at that position
The maximum displacement of points on a wave from the equilibrium position is the wave's wavelength
a. True b. False Indicate whether the statement is true or false
If we had the most powerful optical microscope in the world stacked on top of the next most powerful optical microscope in the world, we would
1) probably see atoms, 2) probably be able to photograph atoms even if we couldn't see them, 3) still not be able to see an atom, because atoms are 4) invisible. 5) visible when illuminated with infrared light. 6) material particles which have mass and size. 7) smaller than the wavelengths of visible light.