A 30-N box is pulled upward 6.0 m along the surface of a ramp that rises at 37° above the horizontal. How much work does gravity do on the box during this process?
A) -1100 J
B) -110 J
C) -140 J
D) -180 J
E) 120 J
B
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Which of the following explains why electrons must arrange themselves in atoms with no more than two per energy level, thus making chemistry possible?
A) the exclusion principle B) the uncertainty principle C) the law of conservation of energy D) the law of conservation of angular momentum E) the electromagnetic force law
Most of the mass of the universe is in the form of
A) stars B) gas clouds C) black holes D) dark matter
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The period of the electromagnetic oscillations in the circuit is
A. 0.0227 s. B. 0.377 s. C. 2.26 s. D. 105 s. E. 1750 s.
Polaroid sunglasses help when skiing on snow on a sunny day by reducing the sunlight from the snow. This light from the snow has been polarized by:
a. selective absorption. b. reflection. c. double refraction. d. scattering.