An electron is accelerated through 100 kV. By what factor has its mass increased with respect to its rest mass?
A) 4.25
B) 1.20
C) 8.00
D) 1.55
E)
B
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Galileo used a telescope to discover
a. spots on the Sun. b. craters on the Moon. c. moons around Jupiter. d. moon-like phases of Venus. e. all of above.
The design considerations for a timing mechanism require that a mass of 1.6 g should undergo 5 oscillations per second when it is attached to a spring. What should the force constant of a spring be to achieve this?
A) 15.6 N/m B) 3.1 N/m C) 7.2 N/m D) 1.6 N/m E) 8.0 N/m
In the Compton effect, a photon of wavelength 
and frequency f is scattered from an electron. Initially, at rest
A. the electron gains energy from the photon so that the scattered photon's wave length is less than
B. the electron gives energy to the scattered photon so the photon's frequency is greater than f.
C. momentum is not conserved, but energy is conserved.
D. the photon loses energy so that the scattered photon has a frequency less than f.
The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring
A) the precise wavelengths of spectral lines in the spectrum of the star. B) the precise wavelengths of spectral lines in the spectrum of the orbiting planet. C) the precise brightness of the star divided by the precise brightness of the planet. D) the orbital period of the planet that is orbiting the star.