A series RL circuit is driven by a 120. V, 60. Hz source. The values of the resistance and inductance are R = 20.0 ? and L = 160. mH. Determine:
(a) the current.
(b) the phase angle between the current and the applied voltage.
(a) I = 1.89 A
(b) I lags V by 72°
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How many values of the magnetic quantum number, m?, correspond to a value of 4 for the orbital quantum number, ??
A) 3 B) 5 C) 8 D) 9 E) 7
A star has absolute luminosity equal to that of the Sun (1.5 × 108 km from the Earth) but is 10 pc away from the Earth. By what factor will it appear dimmer than the Sun?
A) 2 × 10-9 B) 2 × 10-11 C) 2 × 10-13 D) 2 × 10-15 E) 2 × 10-17
The planets move ________ through the sky, relative to the background stars.
A. west to east B. retrograde C. northeast to southwest D. east to west E. None of these choices is correct.
Studies of sunquakes, or helioseismology, have revealed that
A) the Sun vibrates only on the surface. B) "sunquakes" are caused by similar processes that create earthquakes on Earth. C) the Sun generates energy by nuclear fusion. D) our mathematical models of the solar interior are fairly accurate. E) neutrinos from the solar core reach the solar surface easily.