At what angle must a fish underwater look in order to see a fisherman at the shore? (Note: n for water is 1.33.)
A) 41.2°
B) 48.8°
C) 60.0°
D) 36.9°
E) 90.0°
B
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A music console is pushed 2 m by a force of 20 N. The work done on the console is
A) 2 J. B) 10 J. C) 20 J. D) 40 J. E) 80 J.
A wire, 1.0 m long, with a mass of 90 g, is under tension. A transverse wave is propagated on the wire, for which the frequency is 890 Hz, the wavelength is 0.10 m, and the amplitude is 6.5 mm. The tension in the line, in SI units, is closest to:
A) 710 B) 820 C) 930 D) 1,000 E) 1,100
Synchrotron radiation is produced by
a. objects with temperature below 10,000 K. b. high-velocity electrons moving through a magnetic field. c. cold hydrogen atoms in space. d. the collapsing cores of massive stars. e. helium flash.
Charged particles from the Sun enter Earth's atmosphere close to the magnetic poles and cause
a. global cooling. b. global warming. c. auroras. d. ozone depletion.