As you increase in altitude in the atmosphere, the speed of sound _________
Fill in the blank(s) with correct word
decreases
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The Sun's radius is one astronomical unit by definition
Indicate whether the statement is true or false
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
In general, when we refer to the time of the "Ice Age" we are referring to the
A) Jurassic. B) Tertiary era. C) Pleistocene epoch. D) Pliocene era.
Relative to a stationary observer, a moving clock
A. always runs slower than normal. B. always runs faster than normal. C. keeps its normal time. D. Any of these choice could be correct depending on the relative velocity.