The net force required to move a body at a constant velocity in outer space is ________
a. zero
b. its weight
c. the force of gravity
d. its mass times its velocity
e. the force of friction
a
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A raindrop is doing its part to form a primary rainbow. Red and blue light enter near the top of the raindrop together from the sun. Both red and blue are reflected once at the back surface of the drop, but when the two rays emerge on the sunward side
A. the red ray lies above the blue ray and is more nearly horizontal than the blue ray. B. the blue ray lies above the red ray and is more nearly horizontal than the red ray. C. the blue ray lies below the yellow ray and is more nearly horizontal than the yellow ray. D. None of these choices are correct
An automobile travels due north with a constant speed of 76 km/h. All forces considered, the unbalanced force acting on the auto is
a. zero. b. southward. c. northward. d. downward. e. upward.
The presence of breccias among the lunar rock samples shows that
a. volcanism did not occur on the moon. b. molten lava once flowed over the lunar surface. c. the crust must have been made of anorthosite. d. water once existed on the moon in the form of small lakes and streams. e. the lunar surface was fragmented by meteorite impacts.
Thin Lenses: A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.