The pressure in a gas:
A) depends on the temperature of the gas.
B) does not depend on the density of the gas.
C) does not depend on the volume of the gas.
D) depends on the gravitational force on the gas.
A
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What did the cosmic microwave background tell cosmologists about the early universe?
A) Nothing; it is a product of the black hole in the center of our own Galaxy. B) The horizon problem, in that the microwave background is almost too isotropic C) The discovery of dark energy and its role in accelerating the universe D) The discovery of relativistic redshifts and the Big Bang E) The dark matter in the universe is mostly baryonic in nature, for a closed Big Bang.
All of the following are true. Which of the following gives evidence that Earth's orbit is not perfectly circular?
A) The Sun's angular size changes throughout the year. B) Earth's seasons are not of exactly equal length. C) In North America, it is hotter in July than January. D) Both A and C E) Both A and B
An object is located in front of a converging lens with focal length F as shown. The image can be described as
A. upright, magnified, and real.
B. upright, diminished, and virtual.
C. inverted, diminished, and real.
D. inverted, magnified, and virtual.
In 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter. Assume that these fragments came from an infinite distance away with zero initial speed and fell into Jupiter
What was their speed when they arrived at Jupiter's surface? Jupiter has a mass of 1.90 × 1027 kg and a radius of 71.4 × 106 m, and G = 6.67 x 10-11 N•m2/kg2. A) 10,400 m/s B) 11,200 m/s C) 35,500 m/s D) 42,100 m/s E) 59,600 m/s