Our calendar is based on the length of the tropical year rather than the sidereal year
Indicate whether the statement is true or false
TRUE
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If an AC circuit consists of a 220 mH inductor in series with a 25 pF capacitor and an AC generator with rms voltage of 12 V. If the frequency of the generator is 55 kHz, what will the rms voltage drop across the capacitor be?
A. 5.4 V B. 0.20 V C. 6.6 V D. 11.80 V
A torque of 15.0 N•m is applied to a bolt. The bolt rotates through an angle of 360 degrees. The work done in turning the bolt is
A. 94.2 J. B. 91.3 J. C. 96.7 J. D. 89.9 J. E. 98.1 J.
A pole-vaulter holds out a 5.5kg, 4.75m pole horizontally in front of him. Assuming the pole is uniform in construction, and that he holds the pole with one hand at the very end, and one hand 0.75m from the end, what is the torque applied by the Earth to the pole?
A. 40N B. 88N C. Not enough information is given D. 128N
How are rotation curves of spiral galaxies determined beyond radii where starlight can be detected?
A) by extrapolation B) through observations of the 21 cm line of atomic hydrogen C) through observations of spectral lines of dark matter D) by watching the galaxies rotate over a period of years E) by measuring the broadening of absorption lines