Silicates
a. are minerals.
b. contain silicon and oxygen.
c. consist of tetrahedra.
d. all of the above.
d
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A heat engine exhausts 3 200 J of heat while performing 1 500 J of useful work. What is the efficiency of the engine?
a. 68% b. 32% c. 16% d. 50% e. 84%
The scarps on Mercury were probably caused by:
A) tectonic activity. B) meteorite bombardment. C) a tidal bulge. D) volcanism. E) the interior cooling and shrinking.
What is the first law of thermodynamics?
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The two rotating systems shown in the figure differ only in that the two identical movable masses are positioned at different distances from the axis of rotation
If you release the hanging blocks simultaneously from rest, and if the ropes do not slip, which block lands first? A) The block at the left lands first. B) The block at the right lands first. C) Both blocks land at the same time.