Make a drawing illustrating the positions of the Sun, the Moon, and Earth during a total solar eclipse. Show the shadows of both the Moon and Earth. (It is not necessary to make the drawing to scale.)
See Figure 17.9 in the textbook.
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A uniform rod of mass M = 1.2 kg and length L = 0.80 m, lying on a frictionless horizontal plane, is free to pivot about a vertical axis through one end, as shown. The rotational inertia of the rod about this axis is given by (1/3)ML2. If a force (F = 5.0 N, ? = 40°) acts as shown, what is the resulting angular acceleration about the pivot point?
?
?
A. 16 rad/s2 B. 12 rad/s2 C. 14 rad/s2 D. 10 rad/s2 E. 33 rad/s2
Suppose you find a meteorite made almost entirely of metal. According to current science, which of the following statements must be true?
A) Your meteorite is a fragment of an object from the Kuiper belt. B) Your meteorite is a fragment from the core of a large asteroid that shattered in a collision. C) Your meteorite was blasted off the surface of Mars by an impact. D) Radiometric dating will show the age of your meteorite to date to the formation of our solar system.
How do we think the "hot Jupiters" around other stars were formed?
A) They formed as jovian planets close to the star in the same orbits that they are seen today. B) They formed as dense, rocky planets close to the star in the same orbits that they are seen today. C) They formed as jovian planets beyond the frost line and then migrated inward. D) Many planets were formed around the star but coalesced into a single planet close in. E) They spun off from the young star when it was rapidly rotating.
What is the equivalent resistance between points a and b?
a.
14 ?
b.
8.0 ?
c.
6.0 ?
d.
25 ?
e.
40 ?