A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?
A) 1180 W
B) 1320 W
C) 520 kW
D) 3.14 MW
E) 1.25 MW
A
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Three resistors,
are connected in parallel to a 9.00 V battery. What is the total power dissipated in the circuit?
A. 180 W B. 117 W C. 99.0 W D. 80.1 W E. 18.0 W
The temperature of the innermost part of the spinning gas near our galaxy's central black hole is:
A) 2.7 K. B) 300 K. C) 10,000 K. D) over 1,000,000 K. E) varying rapidly from 300 K to 1,000,000 K.
A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense. (a) For points OUTSIDE the loop, the magnetic field caused by this current A
circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero. (b) For points INSIDE the loop, the magnetic field caused by this current A. circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero.
Which one of the following choices is not a possible way to produce a magnetic field?
a) Set up a current in a long, straight wire. b) Uniformly distribute charges over the surface of a conductor. c) Make an object out of materials that have an intrinsic magnetic field. d) Pass a current through a coil of wire.