While an iron block near the Earth's surface is in free fall downward, it undergoes an increase in
A) Speed
B) Acceleration
C) Both of these
D) Neither of these
Answer: A) Speed
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If a comet's ion tail is pointing perpendicular to its direction of travel, the comet is
A) close to or at aphelion. B) moving away from the Sun. C) close to or at perihelion. D) moving closer to the Sun. E) A comet's tail never points perpendicular to its motion.
When the Sun rises it is located in the constellation Gemini. When the Sun sets later that same day it will be
A) in the constellation Aries. B) in the constellation Taurus. C) in the constellation Gemini. D) in the constellation Cancer. E) in the constellation Leo.
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
A. R = 0.40 km, and the car's speed is decreasing. B. R = 0.20 km, and the car's speed is decreasing. C. R = 0.20 km, and the car's speed is increasing. D. R = 0.16 km, and the car's speed is increasing. E. R = 0.16 km, and the car's speed is decreasing.
Which of following statements about the image formed by a single concave lens are true? (There could be more than one correct choice.)
A) The image is always real. B) The image is always virtual. C) The image is always inverted. D) The image is always upright. E) The image is always smaller than the object.