Most likely, before biological evolution there was
A) chemical evolution
B) physical evolution
C) geological evolution
D) no evolution of any kind
A
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If the kinetic energy of a proton is 80% of its total energy, what is the speed of the proton?
A) 0.02c B) 1.0c C) 0.87c D) 0.98c
Force on a Wire: When the switch is closed in the circuit shown in the figure, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A. a north magnetic pole. B. a south magnetic pole. C. There is not enough information given to answer the question.
The earth's northern magnetic pole is located
A) near Tasmania. B) near Antarctica. C) at the North Pole. D) at the South Pole. E) in northern Canada.
Holding out your hands sideways helps you keep your balance along a narrow set of stepping-stones because
A. the arms outward balance your weight. B. moving the arms outward puts a counter-torque on the stepping-stones. C. arms inward only add to your weight. D. with arms outward, you've increased your total rotational inertia relative to the pivot point: your feet.