The Moon revolves around Earth
a. in a clockwise direction, as viewed from above Earth's North Pole.
b. once every day.
c. once every 7-3/8 days.
d. none of these
a
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For the lead-tin phase diagram in Figure 5.11a,
Which of the following is true of ancient astronomers?
A) They believed that each star could be part of only one constellation. B) They believed that the sky was a great sphere surrounding Earth. C) They believed that Earth revolved around the Sun. D) They believed that stars were scattered through space at different distances.
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.
?
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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.
A 4.0-mF capacitor initially charged to 50 V and a 6.0-mF capacitor charged to 30 V are connected to each other with the positive plate of each connected to the negative plate of the other. What is the final charge on the 6.0-mF capacitor?
a. 20 mC b. 8.0 mC c. 10 mC d. 12 mC e. 230 mC