A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?
A. It increases.
B. It decreases.
C. It stays the same.
D. In some cases it would decrease, in others it would stay the same.
E. In some cases it would increase, in others it would stay the same.
Answer: B
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A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about
A) 0.001 m/s. B) 0.01 m/s. C) 0.1 m/s. D) 1 m/s. E) none of these
The velocity of a particle (m = 10 mg, q = ?4.0 ?C) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
A. 60 m/s B. 20 m/s C. 45 m/s D. 40 m/s E. 70 m/s
A component in an automobile 12-V electrical system has a resistance of 90 ?. How much current is in the component when in operation?
a. 100 A b. 0.13 A c. 7.5 A d. 1100 A
In the figure below, a hoop (radius R = 1.0 m, mass = 2.0 kg) having four spokes of negligible mass is suspended from a pivot a distance d = .25 m above its center of mass. The angular frequency (in rad/s) for small oscillations is approximately
?
?
A. 4.0. B. 2.5. C. 1.5. D. 1.0. E. 0.5.