The force on a charged object divided by the charge on the object is
a. voltage.
b. current.
c. resistance.
d. electric field.
e. critical temperature.
d
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Work: A 35-N bucket of water is lifted vertically 3.0 m and then returned to its original position. How much work did gravity do on the bucket during this process?
A. 180 J B. 90 J C. 45 J D. 0 J E. 900 J
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When a 500-N parachutist opens his chute and experiences 800 N of air resistance, the net force on him is
A) 300 N downward. B) 500 N downward. C) 800 N downward. D) 300 N upward. E) 500 N upward.
Warm air has a higher capacity for water vapor, because in warm air
A) fast-moving water-vapor molecules are too energetic to stick together. B) molecules expand. C) water-vapor molecules condense. D) there are more water vapor molecules than in cool air.