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238.The strength of gravity on Mars is about 40% of that on the Earth. If you were to take a

238.The strength of gravity on Mars is about 40% of that on the Earth. If you were to take a standard red brick to Mars, which property of the brick would be significantly different on Mars than on the Earth?A) Its mass B) Its color C) Its volume D) Its weight

109.Tycho BraheA)developed a reflecting telescope, which used a curved mirror to focus the light.B)developed the first detailed heliocentric model for

109.Tycho BraheA)developed a reflecting telescope, which used a curved mirror to focus the light.B)developed the first detailed heliocentric model for the solar system, which replaced the geocentric model of Ptolemy.C)improved the refracting telescope, which allowed him to extend Galileo’s observations of the sky.D)made accurate measurements of planetary positions, which Kepler later used to find the shapes of planetary orbits.

123.The eccentricity of a planet’s orbit describesA)the tilt of the planet’s spin axis with respect to its orbital plane.B)its shape

123.The eccentricity of a planet’s orbit describesA)the tilt of the planet’s spin axis with respect to its orbital plane.B)its shape compared to that of a circle.C)its motion at any specific point in its orbit as seen from the Earth, that is, whether direct, retrograde, or stationary.D)its tilt with respect to the plane of the Earth’s orbit (the ecliptic plane).

138.If the line joining a planet to the Sun sweeps out a particular area in 1 day, then in 2

Astronomy138.If the line joining a planet to the Sun sweeps out a particular area in 1 day, then in 2 days it will sweep outA)less than twice the area if the planet is approaching perihelion and more than twice the area if it is leaving perihelion.B)half the area.C)more than twice the area if the planet is approaching perihelion and less than twice the area if it is leaving perihelion.D)exactly twice the area.

166.Suppose we were to observe two supernovas (exploding stars) exploding in our night sky on a particular night. If one

166.Suppose we were to observe two supernovas (exploding stars) exploding in our night sky on a particular night. If one was in the nearby arm of our Milky Way Galaxy while the other was in the Andromeda Galaxy, M31, 2 million light-years away from us, which of the following statements is correct concerning the actual explosion times of these supernovas?A)We know both stars exploded at the same time because we saw the explosions at the same time.B)We cannot tell which star actually exploded first because they are so far away.C)The supernova in the Andromeda Galaxy actually occurred after the one in our Galaxy.D)The supernova in the Andromeda Galaxy actually occurred before the one in our Galaxy.

171.The Crab Nebula (Chapter 13, Comins and Kaufmann, Discovering the Universe,7th Ed.) is the result of a supernova explosion of

171.The Crab Nebula (Chapter 13, Comins and Kaufmann, Discovering the Universe,7th Ed.) is the result of a supernova explosion of a star that occurred at a distance of about 1.84 kpc from the Earth. If people first saw the explosion in the year 1054 A.D., when did the explosion actually occur?A)About 1048 A.D.C)1054 A.D., of courseB)786 B.C.D)about 4946 B.C.

183.What fundamental belief about the universe, established by the Greeks and adopted by the early Christian church, was shattered by

183.What fundamental belief about the universe, established by the Greeks and adopted by the early Christian church, was shattered by Galileo’s observation of moons orbiting Jupiter?A)The belief that our Moon was the only moon orbiting around a planet in our solar systemB)The belief that everything in the visible universe must orbit the center of the Milky Way GalaxyC)The belief that everything in the universe orbits the EarthD)The belief that everything in the universe orbits the Sun

231.A horse is dragging a loaded sled across a field. Which of the following pairs of forces is an action-reaction

231.A horse is dragging a loaded sled across a field. Which of the following pairs of forces is an action-reaction pair by Newton’s third law?A)The force of the horse on the sled and the force of the ground on the sledB)The force of the horse on the sled and the force of the sled on the horseC)The force of the horse on the sled and the force of the ground on the horseD)The force of the sled on the ground and the force of the horse’s hooves on the ground

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