The Sloan Digital Sky Survey uses:
A) a single space-based telescope.
B) a single Earth-based telescope.
C) an array of Earth-based telescopes.
D) several widely distributed Earth-based telescopes.
E) several space-based telescopes.
B
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Are you in orbit around anything?
A) No, because you are at rest relative to space. B) No, because you are at rest relative to Earth's surface. C) Yes, you are in orbit around the sun. D) Yes, you are in orbit both around the sun and around Earth's center. E) Yes, you are in orbit around Earth's center.
According to the principle of equivalence, acceleration is equivalent to
A) velocity. B) net force. C) gravity. D) the state of free-fall. E) energy.
A rising balloon is buoyed up with a force equal to the
A) weight of air it displaces. B) density of surrounding air. C) atmospheric pressure. D) weight of the balloon and its contents. E) all of the above
Exhibit 13-1
Two blocks of masses m1 and m2 are connected by a light cord that passes over a pulley of mass M, as shown. Block m2 slides on a frictionless horizontal surface. The blocks and pulley are initially at rest. When m1 is released, the blocks accelerate and the pulley rotates.
?
?
Use this exhibit to answer the following question(s).
Refer to . The total angular momentum of the system of the two blocks and the pulley relative to the axis of rotation of the pulley is
a.
the same at all times.
b.
proportional to l1, the length of string from the pulley to m1.
c.
proportional to l2, the length of string from the pulley to m2.
d.
conserved because the Earth doesn't move.
e.
proportional to the speed of the blocks.