Two planets in space gravitationally attract each other. If both the masses and distances are doubled, the force between them is
A) one-quarter.
B) half as much.
C) twice as much.
D) four times as much.
E) none of the above
Answer: E
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Double-Slit Interference: In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.0400 mm. If the second order bright fringe is measured to be 4.20 cm from the centerline on the screen, what is the wavelength of light?
A. 200 nm B. 381 nm C. 401 nm D. 620 nm E. 763 nm
A method for identifying a black hole is to:
A) look for voids in the star fields. B) look for their effects on nearby companions. C) locate a visible star that disappears when the black hole passes in front of it. D) search for radio waves from the accretion disk. E) search for their pulsar signal.
The competition between the electrostatic force between the protons in a nucleus and the strong nuclear force determines whether a nucleus is stable
Indicate whether the statement is true or false
In which of the following cases would you feel weightless?
A) while walking on the Moon B) while falling from an airplane with your parachute open C) while traveling through space in an accelerating rocket D) while falling from a roof E) none of the above