Each halogen atom, such as chlorine, fluorine, and bromine, in Earth’s atmosphere contributes to
a. the production of carbon dioxide.
b. the production of acid rain.
c. the destruction of ozone over decades and centuries.
d. the destruction of water in the upper atmosphere.
Answer: c. the destruction of ozone over decades and centuries.
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A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?
a. 1 solar masses b. 2 solar masses c. 4 solar masses d. 8 solar masses e. 16 solar masses
Our most detailed maps of Venus come from:
A) the Magellan space probe. B) the Hubble Space Telescope. C) direct observation from Earth based optical telescopes. D) manned landings. E) Earth based radio telescopes.
The oldest hominid so far discovered dates back to
A) 540 million years ago B) 65 million years ago C) a few thousand years ago D) 6 to 7 million years ago
A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car? For purposes of this problem, neglect the weight of the pistons. A) 727 N B) 926 N C) 2900 N D) 3330 N E) 1.20 kN