Which is the most expensive source of electric power in common use today?
a. nuclear power
b. standard batteries
c. alkaline batteries
d. watch batteries
e. hydroelectric power
d
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Potential: A proton is accelerated from rest through a potential difference V0 and gains a speed v0. If it were accelerated instead through a potential difference of 2V0, what speed would it gain?
A. 8v0
B. 4v0
C. 2v0
D. v0
A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest to its lowest point. He also estimates that the distance between adjacent wave crests is 48 m
What is the speed of the waves going past the pier? A) 1.0 m/s B) 20 m/s C) 10 m/s D) 5.0 m/s E) 115 m/s
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^-23 m. c. 1.84 × 10^-14 m. d. 1.80 × 10^-13 m. e. 2 m.
The speed of light in a particular transparent medium is 2/8 the speed of light in a vacuum. What is the index of refraction of the material?
a. 1.3 b. 0.75 c. 4 d. 0.25