An originally neutral electroscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electroscope
A)
remains neutral.
B)
is negatively charged.
C)
is positively charged.
D)
could be either positively or negatively charged, depending on how long the contact with ground lasted.
B
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Power: Jill does twice as much work as Jack does and in half the time. Jill's power output is
A. the same as Jack's power output. B. one-fourth as much as Jack's power output. C. one-half as much as Jack's power output. D. twice Jack's power output. E. four times Jack's power output.
Two blocks are connected by a string that goes over an ideal pulley as shown in the figure. Block A has a mass of 3.00 kg and can slide over a rough plane inclined 30.0° to the horizontal
The coefficient of kinetic friction between block A and the plane is 0.400. Block B has a mass of 2.77 kg. What is the acceleration of the blocks? A) 0.392 m/s2 B) 1.96 m/s2 C) 3.12 m/s2 D) 5.35 m/s2 E) 0.00 m/s2
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