Which of these represents an example of simple harmonic motion?
(i) a bouncing ball
(ii) a marble rolling back and forth in a concave bowl
(iii) a tree branch vibrating
(iv) someone walking back and forth across a room, dozens of times
1.all of them
2.(i) and (iv)
3.(ii) and (iii)
4.(i) and (iii)
3
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If gravity is unimportant, and H equals 75 km/sec/Mpc, then the age of the universe is about
a. 8.9 billion years. b. 13 billion years. c. 16.6 billion years. d. 26 billion years. e. 74 billion years.
Which of these planets is approximately the same size as Earth?
a. Venus b. Mars c. Saturn d. Mercury e. Pluto
A rock is moving with speed v. If the mass of the rock were tripled and the speed were reduced to v/3, which of the following statements would be true?
a. The kinetic energy of the rock is smaller than in the first case, but the momentum is larger. b. The kinetic energy of the rock is smaller than in the first case, but the momenta of both are the same. c. The kinetic energies of the rocks are the same in both cases. d. The kinetic energy of the rock is 1/9 its previous value.
A spaceship is traveling to the moon. At what point is it beyond the pull of Earth's gravity?
A) when it is closer to the moon than it is to Earth B) when it gets above the atmosphere C) when it is half-way there D) when it is three-fourths of the way there E) It is never beyond the pull of Earth's gravity.