What is the best explanation for how the solar nebula was cleared of debris?
A) The strong solar wind of the young Sun blew away material not accreted by the planets.
B) The planets accreted all the material around them, leaving no debris.
C) All of the debris eventually fell into the Sun.
D) The debris collapsed to form moons.
E) The debris all disappeared through radioactive decay.
A) The strong solar wind of the young Sun blew away material not accreted by the planets.
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Pressure in a Liquid: The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3.
A. 1.09 × 106 Pa B. 1.16 × 106 Pa C. 1.09 × 103 Pa D. 1.11 × 105 Pa E. 1.11 × 102 Pa
Why must lander probes on Mars be sterilized before launch?
A) to prevent terrestrial microbes hitching a ride on the probe and contaminating the Martian surface B) to prevent terrestrial microbes destroying the electronics in the probe during its passage to Mars C) to prevent Martian dust from building up on the probe on the surface D) to prevent Martian microbes from contaminating the lander probe
One horsepower is equal to
A) 550. watts. B) 746. watts. C) 746. J. D) 550. J. E) 550. kW-h.
Since accelerations are equivalent to gravity, a person could cancel the effects of Earth's gravity by
A) falling from a high place. B) going into orbit around Earth. C) Both of the above. D) accelerating straight upward at an acceleration of 1g. E) Nonsense--you can't cancel the effects of gravity.