A refrigerator uses 40.0 J of work to extract 90.0 J from a heat reservoir at 
What is the coefficient of performance for the refrigerator?
A. 1.60
B. 2.05
C. 2.25
D. 2.85
C. 2.25
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The scientific method is a simple, mechanical way of grinding facts into understanding
a. True b. False Indicate whether the statement is true or false
The Saros cycle
a. was used in ancient times to predict eclipses. b. is 18 years, 11 days long. c. accounts for the tides seen on Earth. d. was used in ancient times to predict eclipses and is 18 years and 11 days long, e. None of the other choices are correct.
In what part of the electromagnetic spectrum do the biggest telescopes on Earth operate?
A) visible B) ultraviolet C) radio D) X-ray E) infrared
A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N, the work done by the tension in one revolution is ________ J.
Fill in the blank(s) with the appropriate word(s).