A refrigerator has a coefficient of performance of 4. If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, the heat expelled (in cal) into the heat reservoir is
A. 40.5
B. 37.5
C. 36.5
D. 34.5
E. 22.5
Answer: B
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A 50-cm wire placed in an east-west direction is moved horizontally to the north with a speed of 2.0 m/s
The horizontal component of the earth's magnetic field at that location is 25 ?T toward the north and the vertical component is 50?T downward. What is the emf induced between the ends of the wire? A) 10 µV B) 20 µV C) 30 µV D) 40 µV E) 50 µV
A force of 1 N accelerates a 1-kg mass at 1 m/s2. The acceleration of a 2-kg mass acted upon by a force of 2 N is
A) half as much. B) twice as much. C) the same. D) none of the above
Radio waves are reflected by which of the following ion layers?
a. C b. D c. F d. A
The molecular formula of "buckyball" is ______________
Fill in the blank(s) with correct word