Which of the following represents the equipotential lines of a dipole?
a.
b.
c.
e
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A heat engine has an efficiency of 31.4% and receives 8.72 kJ of heat per cycle
(a) How much work does it perform in each cycle? (b) How much heat does it exhaust in each cycle?
The energy conversion represented by an automobile speeding up along a level road is
A) chemical to kinetic. B) chemical to gravitational. C) thermal to chemical. D) gravitational to kinetic. E) kinetic to chemical.
Repeatedly dipping your fingers into water produces waves. Increasing the frequency of dipping produces waves that are
A) shorter. B) longer. C) the same.
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