Energy in Capacitors: When a 6.00-?F air-filled capacitor has a charge of ±40.0 ?C on its plates, how much potential energy is stored in this capacitor?
A. 103 ?J
B. 113 ?J
C. 123 ?J
D. 133 ?J
E. 143 ?J
Answer: D
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A. west; east (moves eastward) B. east; west (moves westward)
Four waves are described by the following equations, where distances are measured in meters and times in seconds
I. y = 0.12 cos(3x - 21t) II. y = 0.15 sin(6x + 42t) III. y = 0.13 cos(6x + 21t) IV. y = -0.23 sin(3x - 42t) Which of these waves have the same speed? A) I and II B) I and III C) II and III D) III and IV E) II and IV
If the rms speed of helium atoms is vrms,He at temperature T, what is the rms speed of CO2 at the same temperature?
A.
B.
C.
D.
E.
Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals, in phase, at a frequency of 4.70 MHz
A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 108 m/s) A) 5.1 min B) 3.8 min C) 6.4 min D) 7.7 min E) 8.9 min