The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude.
B. attractive and unequal in magnitude.
C. repulsive and equal in magnitude.
D. attractive and equal in magnitude.
C. repulsive and equal in magnitude.
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As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.
A helium balloon rises because of
a. Archimedes' principle. b. Pascal's principle. c. Bernoulli's principle. d. Torricelli's principle. e. none of these principles.
Assume that a closed system undergoes a reversible process that takes it from state A to a different state B. In which of these cases will the entropy of the system remain constant? ea breeze is
1.if the process is isothermal 2.if the process is adiabatic 3.if the process is isovolumetric 4.The system's entropy will remain constant for all of these cases.
Why is there a two-day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee. B) The sidereal day is four minutes shorter than the solar day, and it adds up. C) The Earth is closer to the Sun during the sidereal month. D) The Earth is also revolving around the Sun, so the Moon must "catch up." E) The Moslem lunar year is only 354 days long, on average.