A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at 
If the coefficient of performance of the refrigerator is 2.10, then how much heat is discharged out of the refrigerator at a higher temperature?
A. 52.0 J
B. 66.0 J
C. 86.0 J
D. 124 J
D. 124 J
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The reason why ancient astronomers thought that Earth could not be moving was because stars lacked any measurable parallax beyond one degree
a. True b. False Indicate whether the statement is true or false
Intensity: What is the maximum value of the magnetic field at a distance of 2.5 m from a light bulb that radiates 100 W of single-frequency sinusoidal electromagnetic waves uniformly in all directions? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ?· m/A, c = 3.0 × 108 m/s)
A. 0.10 ?T B. 0.40 ?T C. 0.50 ?T D. 0.60 ?T E. 0.80 ?T
There is some possibility that humanity could ruin large parts of the environment through concentration on individual gain at societal cost. This is known as
a. the tragedy of the commons. b. freedom. c. the free lunch. d. the outcome of economic progress. e. sustainable development.
A rock is dropped from a vertical cliff. The rock takes 7.00 s to reach the ground below the cliff. What is the height of the cliff?
A) 80.1 m B) 240 m C) 100 m D) 26.2 m E) 481 m