In the Northern Hemisphere, winter shadows are longer because ________.
A. the Sun moves through the sky closer to the horizon
B. the Sun is in the sky for a longer period of time
C. the Sun is in the sky for a shorter period of time
D. the Sun moves through the sky farther from the horizon
E. None of these choices is correct.
Answer: A
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The drift speed of electrons that compose current in a flashlight is about
A) the speed of sound waves in metal. B) the speed of light. C) 1000 cm/s. D) less than 1 cm/s. E) any of the above under different conditions.
Young's Modulus: When a 125-kg piece of equipment is hung from a steel wire of length 75 cm, it stretches the wire by 4.00 mm. If instead the wire had a length of 150 cm, but all else were the same, by what distance would the same equipment stretch the wire?
A. 16.0 mm B. 8.00 mm C. 4.00 mm D. 2.00 mm E. 1.00 mm
How is the sun situated in the universe?
A) The sun is an isolated star that is far outside of all the galaxies in the universe, and is thus not part of any galaxy. B) The sun is just one of a large number of stars, and is located on the fringes of the Milky Way galaxy, which itself is just one galaxy among many galaxies. C) The sun is just one of many stars, and is located near the center of the rest of the stars in the universe. D) The sun is at the center of the universe. E) Earth is at the center of the universe, and the sun orbits around the earth.
A 200-kg spacecraft is launched to the Moon. After it has landed on the Moon, its weight is ________.
A. zero B. 200 kg C. about 1/6 its weight on Earth D. The answer depends on which side of the Moon the spacecraft landed on.