A very small object carrying -6.0 ?C of charge is attracted to a large, well-anchored, positively charged object. How much kinetic energy does the negatively charged object gain
if the potential difference through which it moves is 3.0 mV? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 0.50 kJ B) 18 nJ C) 6.0 ?J D) 0.50 J
B
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When a constant and sustained upward force acts on a rocket, its acceleration increases mainly because
A) gravity becomes weaker with increased distance. B) the mass of the rocket decreases as fuel is burned. C) No way, for acceleration would be constant.
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
A. 10 m/s; 9.8 m/s2. B. 9.0 m/s; 9.8 m/s2. C. 9.0 m/s; 9.0 m/s2. D. 1.0 m/s; 9.0 m/s2. E. 1.0 m/s; 9.8 m/s2.
The effect of de-forestation on the global warming problem is that
A) this makes the problem worse, because trees consume ozone from the atmosphere. B) this actually helps solve the problem, because trees consume ozone from the atmosphere. C) this actually helps solve the problem, because trees consume carbon dioxide from the atmosphere. D) this has no effect on the global heating problem, although it has harmful effects in other ways. E) this makes the problem worse, because trees consume atmospheric carbon dioxide.
A tall cell-phone tower is 12 cm in diameter over much of the height. A wind blows at 25 m/s. The frequency of the vortices being shed from the tower is nearest:
(A) 44 Hz (B) 33 Hz (C) 22 Hz (D) 0 Hz