One end of a copper rod is in thermal contact with a hot reservoir at T = 500 K and the other end is in thermal contact with a cooler reservoir at T = 300 K. Find the entropy change of each reservoir, and the total entropy change, when 8 000 J of heat energy are conducted from one end of the rod to the other with no change in the temperature distribution in the rod
-16.0 J/K, +26.7 J/K, +10.7 J/K
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The angular resolution of the eye is about 5 × 10-4 rad. The Moon is about 400,000 km from the earth and has a diameter of about 3500 km. What is the smallest feature on the Moon that can be resolved with the unaided eye?
A) 400 km B) 1000 km C) 100 km D) 1.8 km E) 200 km
In an AC circuit, the ratio of average current to maximum current is:
a. zero. b. 0.5. c. 0.707. d. 1.0.
Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires?
a. 1.0 mN b. 0.50 mN c. 1.1 mN d. 1.5 mN e. 2.0 mN
If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two hour long movie
a. 1400 b. 25000 c. 50000 d. 170000 e. This cannot be determined without knowing how many reels were used.