Several electrons are placed on a hollow metal sphere. They

A) clump together on the sphere's inner surface.
B) clump together on the sphere's outer surface.
C) become uniformly distributed on the sphere's outer surface.
D) become uniformly distributed on the sphere's inner surface.


C

Physics & Space Science

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Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m

A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 1.00 m parallel to the wall, she experiences destructive interference for the first time. What is the frequency of the sound? The speed of sound in air is 343 m/s. A) 211 Hz B) 422 Hz C) 674 Hz D) 512 Hz E) 256 Hz

Physics & Space Science

A car has a mass of 2,000 kg and travels at 20.0 m/s. If the drag force is 100 N, the power the engines have to provide to keep moving at constant speed is

A. 2.0 kW. B. 2.9 kW. C. 3.4 kW. D. 3.9 kW. E. 4.2 kW.

Physics & Space Science

The moment of inertia of a solid cylinder about its axis is given by 0.5MR2. If this cylinder rolls without slipping, the ratio of its rotational kinetic energy to its translational kinetic energy is

A) 1:2 B) 1:3 C) 2:1 D) 1:1 E) 3:1

Physics & Space Science

Thin Lenses: Is it possible to see a virtual image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. B. No, since virtual images do not really exist. C. Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. D. Yes, but only by using an additional lens to form a real image before the light reaches the eye.

Physics & Space Science