A 1.5-H inductor is connected in series with a 200-? resistor through an ideal 15-V dc power supply and an open switch. After closing the, what is the maximum energy that will be contained in the inductor?
A) 3.2 mJ B) 1.2 mJ C) 5.2 mJ D) 2.2 mJ E) 4.2 mJ
E
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Which internal energy source(s) produce(s) heat by converting gravitational potential energy into thermal energy?
A) accretion B) differentiation C) radioactivity D) both accretion and differentiation E) all three of accretion, differentiation, and radioactivity
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The angular frequency of the electromagnetic oscillations in the circuit is
a. 36.0 × 10^?4 rad/s. b. 6.00 × 10^?2 rad/s. c. 2.78 rad/s. d. 16.7 rad/s. e. 277 rad/s.
Which of the following models best explains why our galaxy has spiral arms?
A) No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy. B) The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation. C) The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates. D) The spiral arms are a wave of star formation caused by wave of density propagating outward through the disk of the galaxy.
Using 0.0200 mol of an ideal monatomic gas, an isochoric process from A (230 kPa, 1.00 L) to B (98 kPa, 1.00 L) results in what change in internal energy?
A. -200 J B. +200 J C. -375 J D. +375 J