Even a little first-grader can stay up on a bicycle if he can get his bicycle moving fast enough because
A. the first-grader's weight causes a torque too small to make the bicycle fall sideways when moving.
B. the angular momentum of the wheels wants to stay horizontal, due to conservation of angular momentum.
C. pedaling faster is easier once you are stable, and more pedaling increases net angular momentum.
D. All of these choices are correct
Answer: D
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A. 57.6 J B. 64.0 J C. 78.8 J D. 122 J
The surface of a protostar radiates energy while its core
A) shrinks and cools. B) shrinks and maintains a constant temperature. C) shrinks and heats. D) expands and cools.
A 2000 V/m electric field is directed along the +x-axis. If the potential at x = 10 m is 800 V, what is the potential at x = 6 m?
A) 8800 V B) 2000 V C) 7200 V D) 4400 V E) 1600 V
According to Galileo, inertia is a
A) force like any other force. B) special kind of force. C) property of all matter. D) concept opposite to force.