As a helium-filled dirigible rises in the atmosphere, the buoyancy force is expected to
A) increase.
B) remain constant.
C) decrease.
C
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The speed of sound in water is 4.3 times the speed of sound in air. A whistle produces a sound wave in air with a frequency 
When this sound wave enters the water, its frequency becomes
A. 4.3 
B. 
C. 
D. not enough information
Ellen places an object 48.4 cm from a concave lens. If a virtual image appears 24.6 cm from the lens on the same side as the object, what is the focal length of the lens?
a. –16.3 cm b. –50.0 cm c. 732 cm d. –23.8 cm e. –36.5 cm
To cause an object to move in a circle, a ______________ force is necessary
a. balanced b. functional c. centripetal d. centrifugal
Why did Copernicus hesitate to consider alternatives to the Ptolemaic Universe? a. A heliocentric Universe contradicted Christian theology at the time
b. There was no way to prove uniform circular motion. c. New star formation showed no parallax. d. Most people already believed in a heliocentric Universe. e. His mathematics could not disprove Ptolemy's epicycles, deferents and equants.