The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.42 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4)
A)
6.30 × 103 K
B)
8.25 × 103 K
C)
8.87 × 103 K
D)
3.93 × 107 K
E)
5.78 × 107 K
A
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A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T ? m/A)
A) 9.8 × 10-6 N B) 7.8 × 10-7 N C) 9.8 × 10-8 N D) 4.9 × 10-6 N
What do we mean by "The Oxygen Crisis" in relation to the evolution of life on Earth?
A) the extinction of older anaerobic life as oxygen builds up in the atmosphere B) the time period before the development of the ozone layer C) a period when evolution accelerated so rapidly that there was insufficient oxygen available D) the destruction of oxygen in the early atmosphere
Radiant energy emitted by our planet is
A) terrestrial energy. B) the outcome of radioactivity in Earth's interior. C) electromagnetic. D) all of the above
An uncharged spherical conducting shell surrounds a charge -q at the center of the shell. Then charge +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are respectively
a. +q, -q. b. -q, +q. c. +q, +2q. d. +2q, +q. e. +3q, 0.