Which are consequences of different speeds of light in different media?
A) mirages
B) rainbows
C) brilliant colors of diamonds
D) all of the above
E) none of the above
Answer: D
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As a 6 solar-mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) remains roughly constant. B) decreases. C) first increases, then decreases. D) increases. E) first decreases, then increases.
A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. He slides all the way down to the valley bottom where his gravitational potential energy becomes zero. His kinetic energy at the bottom will be
a. 0 J c. some value between 0 and 500 J b. 500 J d. none of the above
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Conservation of Momentum: A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? (There could be more than one correct choice.)
A. The momentum of the truck is conserved. B. The momentum of the car is conserved. C. The car and the truck must undergo the same change in speed. D. The momentum of the car and the momentum of the truck are each conserved. E. The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved.