A parachutist falling at constant velocity is in a state of
A) dynamic equilibrium.
B) non-dynamic equilibrium.
C) being in and out of dynamic equilibrium.
D) none of the above
Answer: A
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When unequal resistors are connected in parallel in a circuit,
A) the same current always runs through each resistor. B) the potential drop is always the same across each resistor. C) the largest resistance has the largest current through it. D) the power generated in each resistor is the same.
The totally eclipsed Moon glows coppery red because sunlight reaches the Moon's surface after passing through Earth's atmosphere
a. True b. False Indicate whether the statement is true or false
Suppose an equation relating position, x, to time, t, is given by x = bt3 + ct4, where b and c are constants. The dimensions of b and c are respectively:
a. T3, T4. b. 1/T3, 1/T4. c. L/T3, L/T4. d. L2/T3, L2/T4.
Suppose two stars are identical except that one is twice as far away from us as the other. Which statement is true?
A) Both stars have the same apparent brightness, but the luminosity of the closer star is four times as great as that of the more distant star. B) Both stars have the same luminosity, but the apparent brightness of the closer star is twice as great as that of the more distant star. C) Both stars have the same luminosity, but the apparent brightness of the more distant star is four times as great as that of the closer star. D) Both stars have the same luminosity, but the apparent brightness of the closer star is four times as great as that of the more distant star.