A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in rad) of the motion at t = 2 s is
a. 7?/3.
b. ?/3.
c. ?.
d. 5?/3.
e. 2?.
a
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After a supernova explosion, the remains of the stellar core ________
A) will always be a neutron star B) may be either a neutron star or a black hole C) will always be a black hole D) may be either a white dwarf, neutron star, or black hole
A moon with a smooth, uncratered surface would imply
A) the surface is completely liquid. B) the surface is very young. C) meteorites have never struck the moon. D) the moon lies within the planet's Roche Limit. E) a strong magnetic field surrounds the moon.
In an isochoric process, there is no change in
A) pressure. B) temperature. C) volume. D) internal energy. E) heat.
To determine the orbital period of a visual binary, we must measure
a. brightness. b. position on the sky. c. wavelengths. d. luminosity. e. temperature.