The second brightest object in the sky is
a. the Sun.
b. the Moon.
c. Venus.
d. Mars.
b
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The material that accretes onto a neutron star or black hole is expected to emit X-rays because
a. the material will produce synchrotron radiation. b. hydrogen nuclei begin to fuse and emit high energy photons. c. the material will become hot enough that it will radiate most strongly a X-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above
Resistance and Resistivity: When a 1.0-m length of metal wire is connected to a 1.5-V battery, a current of 8.0 mA flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 ? ? m.
A. 12 ?m B. 6.0 ?m C. 24 ?m D. 2.2 ?m
Transfer of heat in the Earth's mantle is dominated by
A) radiation B) seismic waves C) convection D) conduction
If energy is released when the parts of a system are allowed to disperse to infinity, its binding energy is
A. Positive. B. Negative. C. Zero. D. Not defined in such a case.