In the H-R diagram, what are the two most important types of data plotted?
A) sizes and temperatures
B) luminosities and masses
C) absolute and apparent magnitudes
D) apparent magnitudes and temperatures
E) spectral classes and absolute magnitudes
E
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Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/A)
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During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J