An object’s x-velocity vx (t) is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its x-position?
A. A
B. B
C. C
D. D
E. E
E. E
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Suppose we put a 0.3-kg hunk of ice at 0°C into an insulating thermos bottle filled with 1000 g of water at 20°C. What will be the system’s final temperature?
A. Below 0°C B. Almost exactly 0°C C. Somewhat above 0°C, but below 10°C D. Very roughly 10°C E. Somewhat below 20°C, but above 10°C F. Almost exactly 20°C
As the speed of a particle approaches the speed of light, the momentum of the particle
A) approaches zero. B) approaches infinity. C) transforms to energy. D) is no longer in spacetime.
A ball falls to the ground from height h and bounces to height h'. Momentum is conserved in the ball-earth system
a. no matter what height h' it reaches. b. only if h' < h. c. only if h' = h. d. only if h' > h. e. only if h' ³ h.
A sphere is constructed of two concentric pieces. The inner part is a solid sphere of radius 10.0 cm made of a material with density 4000 kg/m3. The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm
The outer shell has a density 9000 kg/m3. (a) What is the mass of this sphere? (b) What is the average density of this sphere?