A boat is floating in a small pond. The boat then sinks resting on the bottom, but the pond is so shallow that part of the boat is not submerged. What happens to the level of the pond?
a. It increases.
b. It decreases.
c. It stays the same. d. In some cases it would decrease, in others it would stay the same. e. In some cases it would increase, in others it would stay the same.
B
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The figure shows an image of our galaxy, the Milky Way, at dust-penetrating wavelengths. It can be classified as which one of the following galactic types?
A. spiral B. irregular C. elliptical D. red giant
The circuit below contains three 100-W light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) brightest?
A. A B. B C. C D. B and C E. All three are equally bright.
A 0.30-kg rock is swung in a circular path and in a vertical plane on a 0.25-m-length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
a. 7.9 N b. 16 N c. 18 N d. 83 N
A bar magnet and an electrically polarized object are placed next to each other on a table. What happens?
A. The object and magnet accelerate toward each other until they touch and then they repel B. The positive part of the object turns toward the north pole of the magnet C. The positive part of the object turns toward the south pole of the magnet D. Nothing happens