Which of these is characteristic of an ideal (Carnot) heat engine?
A. It creates more energy than it consumes
B. It causes no increase in entropy
C. It cannot be used to cool a house
D. It does not create waste heat
Answer: B
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Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from each wire?
a. 57 ?T b. 80 ?T c. 64 ?T d. 48 ?T e. 40 ?T
The average density of each planet in the solar system is determined by taking its mass and dividing that by its
A) radius. B) diameter. C) surface area. D) radius squared. E) volume.
To transmit four times as much energy per unit time along a string, you can
A. double the frequency. B. double the amplitude. C. increase the tension by a factor of 16. D. do any one of the above. E. do only (a) or (b) above.
My electric razor operates on 120. v and requires 3.0 Amperes. How much current comes out after delivering 360. watts of power?
A) 40. A B) 0. A C) 3.0 A D) 1.2 A E) 2.4 A