Two objects collide and stick together. Which of the following is false?
A. momentum is conserved
B. kinetic energy is lost
C. kinetic energy is conserved
D. momentum is lost
C. kinetic energy is conserved
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Velocity Addition: Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, each with a speed 0.50c relative to Earth. As measured by a passenger in one of the spaceships, how long is the other spaceship?
A. 50 m B. 60 m C. 70 m D. 80 m E. 90 m
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What will be an ideal response?
The image of a real object formed by a single converging lens cannot be
a. real, inverted, and enlarged. b. real, inverted, and the same size as the object. c. virtual, upright, and enlarged. d. real, inverted, and reduced. e. virtual, upright, and reduced.
One explanation of the dark sky Olbers's Paradox is that light can reach us only from objects in space out to a distance in light years _______ the age of the universe in years
a. less than b. greater than c. equal to d. less than or equal to e. greater than or equal to