Which part of the galaxy contains the coldest gas?
A. the disk
B. the halo
C. the bulge
Answer: B. the halo
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A scuba diver losing her air supply while far beneath the water surface is advised when ascending to
A) hold air in her lungs. B) allow air to escape her lungs. C) panic.
The intensity of a sound wave is proportional to its
A) wavelength. B) decibel level. C) power. D) Doppler shift.
As a truck moves away from a person with its horn blowing, the person hears a frequency ______________ than that of the horn
Fill in the blank(s) with correct word
A skilled ballet dancer appears to move in a seemingly floating motion, seeming to defy gravity in a grand jeté. Part of how this is done is by:
a. moving her arms and legs to keep her center of mass at the about same height above the ground. b. moving her arms and legs to cause her center of mass to move upward while falling. c. being supported from the ceiling by a hidden cable not visible to the audience. d. moving her arms and legs so that as her center of mass moves, she keeps her head at the same height above the ground. e. moving her arms and legs so that her center of mass is kept from accelerating downward.