Venus is often called Earth's sister planet because it is similar to the Earth in terms of
a. mass.
b. size.
c. density.
d. mass, size, and density.
d
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Based on current evidence and understanding, what is the composition at the center of Neptune and in fact at the center of all the giant planets in the outer Solar System?
A. swiss cheese. B. liquid core made of hydrochloric acid C. methane gas mixed with water. D. a solid, rocky core. E. There is no core; Neptune just has an atmosphere.
Suppose that a given amount of work is required to crush an aluminum can and you can crush a can by dropping a rock on it from height h on the Earth. On the moon, from approximately what height must you drop the same rock to crush a can?
A. h B. 3h C. 6h D. 9h
The brakes in a car work because of __________ principle
Fill in the blank(s) with correct word
The most energy-efficient form of transportation in the animal kingdom is a human on a bicycle. A basic physics principle that helps explain the bicycle's high efficiency [relative to other technologies for human transportation] is
A) the law of conservation of energy. B) the law of gravity. C) the second law of thermodynamics. D) the electromagnetic force law. E) the work-energy principle.