An astronaut falling into a black hole would see the universe
A) red-shifted.
B) blue-shifted.
C) with no shift at all.
Answer: B
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A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
a. 5.7 m/s b. 8.5 m/s c. 8.1 m/s d. 7.0 m/s e. 6.4 m/s
Imagine that we have two identical metal spheres on insulating stands that we give the same negative charge. If we slowly bring the spheres closer and closer together, the charge per unit area ? on each sphere will at the point nearest the other sphere
A. become increasingly negative. B. become less negative. C. remain constant.
Which model of light is discussed in Chapter 17?
A. Ray model B. Photon model C. Wave model D. Solar model
A 1.0 ?F capacitor has a potential difference of 6.0 V applied across its plates. If the potential difference across its plates is increased to 8.0 V, how much ADDITIONAL energy does the capacitor store?
A) 14 ?J B) 28 ?J C) 2.0 ?J D) 4.0 ?J