Transformers: You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor. How many windings should the secondary circuit contain?
Fill in the blank(s) with the appropriate word(s).
22
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An refrigerator keeps food in the freezer portion at 
and dumps excess heat into the kitchen, whose temperature is 
If the refrigerator has half the coefficient of performance of an ideal reversible refrigerator, what is the refrigerator’s coefficient of performance under these conditions?
A. 1.1 B. 4.2 C. 2.0 D. 3.7
A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.He slides all the way down to the valley bottom where his gravitational potential energy becomes zero. His kinetic energy at the bottom will be
a. 0 J. b. 500 J. c. some value between 0 and 500 J. d. none of the above.
A beam of protons in an accelerator incident on a metal plate carries a current of 150 ?A. How many protons strike the plate in 24.0 s?
a. 1.60E+5 b. 3.60E+9 c. 2.25E+16 d. 3.91E+13
For the multiplication of 4.769 m times 7.20 m, the result should be reported with how many significant figures?
a. Two b. One c. Three d. Four e. Seven