The position of a 0.700-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (?t/16). What is its position at t = 5.80 s?
a. –0.0670 m
b. 0.0622 m
c. 6.25 m
d. 0.0670 m
e. 0.610 m
d
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If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
a. Galaxy A is four times closer than Galaxy B. b. Galaxy A is four times further away than Galaxy B. c. Galaxy A is twice as distant than Galaxy B. d. Galaxy A is twice as close than Galaxy B.
In a fusion reactor, the high temperature of the order of 108 K is required in order that what condition is met?
a. melt down the hydrogen fuel b. strip the hydrogen atoms of their electrons c. break the protons into their elementary particle sub-parts d. overcome Coulomb repelling forces between protons
If y = 0.02 sin (30x ? 400t) (SI units), the angular frequency of the wave is
a. 30 rad/s b. 30/2? rad/s c. 400/2? rad/s d. 400 rad/s e. 40/3 rad/s
A helium atom with only one neutron in its nucleus is called ________.
A. an ion B. deuterium C. an isotope D. a neutrino