An example of conservation of angular momentum is
A. A car going around a corner
B. An ice skater changing the speed of a spin
C. Jumping off a diving board
D. A golf club hitting a golf ball
Ans: B. An ice skater changing the speed of a spin
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Momentum: A satellite, initially at rest in deep space, separates into two pieces, which move away from each other. One piece has a mass of 190 kg and moves away with a speed 0.280c, and the second piece moves in the opposite direction with a speed 0.600c. What is the mass of the second piece?
A. 88.7 kg B. 79.6 kg C. 73.9 kg D. 68.8 kg E. 52.7 kg
A supergiant star's radii may extend out to the _____
a. half the orbit of Mercury b. orbit of Mercury c. orbit of Venus d. orbit of the Earth e. orbit of Saturn
A circus diver drops from a high pole into water far below. When he is halfway down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic energy and potential energy are equal. D) all of the above E) none of the above
You observe a star very similar to our own Sun in size and mass. This star moves very slightly back and forth in the sky once every 4 months, and you attribute this motion to the effect of an orbiting planet
What can you conclude about the orbiting planet? A) The planet must be closer to the star than Earth is to the Sun. B) The planet must be farther from the star than Neptune is from the Sun. C) The planet must have a mass about the same as the mass of Jupiter. D) You do not have enough information to say anything at all about the planet.