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
Physics & Space Science
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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
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Radio waves are reflected by which of the following ion layers?
a. C b. D c. F d. A
Physics & Space Science
The molecular formula of "buckyball" is ______________
Fill in the blank(s) with correct word
Physics & Space Science