Which of these undergoes circular motion?
a. A bullet shot from a gun.
b. A top spinning on a table.
c. A baseball hit by a bat.
d. A satellite orbiting the Earth.
e. An apple falling out of a tree.
d
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A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 Ns. b. 19.6 Ns. c. 29.4 Ns. d. 58.8 Ns. e. 118 Ns.
Small deviations in a planet's orbital motion:
A) show we don't fully understand gravitational forces yet. B) indicate the presence of an extensive atmosphere. C) indicate the presence of a powerful magnetic field. D) imply the nearby presence of a massive body. E) show the planet's orbit isn't stable.
Approximately how many neutrinos pass through your body each second?
A) about a thousand trillion B) about one thousand C) about 1023 D) None; they are blocked by the Earth's atmosphere.
Entropy: Which of the following is a false statement?
A. Entropy is a quantitative measure of disorder. B. The total entropy change in one cycle of a Carnot engine is zero. C. The entropy of an isolated system must be conserved (it remains constant). D. Entropy can be measured in units of J/K.