Work: 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
Answer: B
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Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs continue to glow with the same brightness.
d.
bulb 1 goes out.
e.
bulb 2 goes out.
Spherical Mirrors: An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A. 2.2 cm in front of the mirror B. 2.2 cm behind the mirror C. 9.0 cm in front of the mirror D. 1.0 cm behind the mirror
Which of the following makes a meson?
a) a photon and a graviton b) an up quark and an anti-down quark c) three up quarks d) a charm quark and a strange quark e) two down quarks and an anti-up quark
A layer of water (n = 1.333) floats on carbon tetrachloride (n = 1.461) contained in an aquarium. To the nearest degree, what is the critical angle at the interface between the two liquids?
a. 88° b. 78° c. 66° d. 58° e. 43°