How could you test the hypothesis that the acceleration of gravity does not depend on mass? (Ignore effects of air resistance.)
A) Drop two objects with the same mass from the same height.
B) Drop two objects with the same mass from different heights.
C) Drop two objects with different masses from the same height.
D) Drop two objects with different masses from different heights.
C) Drop two objects with different masses from the same height.
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Moving electric charges make magnetic fields
Indicate whether the statement is true or false
A nearby star has a parallax of 0.2 arc seconds. What is its distance?
A) .1 parsec B) .2 parsec C) .5 parsec D) 5 parsecs E) 50 parsecs
Discrete wavelengths of light are emitted by an excited gas because
a. the speed of light is constant in a given medium. b. light can behave either as a wave or as a particle. c. electron energy levels are quantized. d. the intensity of radiation is proportional to the second power of the frequency.
You could use two parallel wires to move objects 1 and 2 apart if each wire is embedded in its own object and if 
A. one wire carries a current and the other wire has zero current. B. the currents in the wires are in the same direction. C. the currents in the wires are in opposite directions.