A camera lens that covers the film with a wider field of view than that of the eye and through which objects appear smaller is referred to as a
A)
normal lens.
B)
telephoto lens.
C)
wide-angle lens.
D)
zoom lens.
E)
digital lens.
C
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The best determination of the Hubble constant using Cepheid variables found in distant galaxies by the Hubble telescope suggests
a. that the Hubble constant is about 0.07 km/sec/Mpc. b. that the Hubble constant is about 7 km/sec/Mpc. c. that the Hubble constant is about 70 km/sec/Mpc. d. that the Hubble constant is about 700 km/sec/Mpc.
When waves interfere, the result is ________ original waves ("they interfere")
A) always smaller than B) always larger than C) always the same as D) sometimes smaller than, sometimes larger than
A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is
a. 0. b. 0.8 m/s towards the right. c. 0.8 m/s towards the left. d. 2.4 m/s towards the right. e. 2.4 m/s towards the left.
A heat engine operates between 800 K and 300 K, but its efficiency is only 80% of the maximum possible. What is the actual efficiency of the engine?
A) 30% B) 70% C) 38% D) 50% E) 36%