Three equal charges of magnitude + 4.00 ?C are placed at the corners of an equilateral triangle of side 2.00 cm. What is the electric potential energy of the system of these charges?
A)
90.0 J
B)
900 mJ
C)
0 J
D)
216 mJ
E)
21.6 J
E
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Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
A. 40 hrs B. 25 hrs C. 50 hrs D. 65 hrs E. 50000 hrs
A small refrigerator freezer, 16 in x 16 in x 18 in outer dimensions, has an inside surface temperature of 10ºF and an outside surface temperature of 80ºF. If the walls are uniformly 3 inches thick, homogeneous, and with thermal properties the same as Styrofoam, estimate the heat transfer through the walls and door of the refrigerator.
What will be an ideal response?
A car travels along eastward with a constant velocity. The magnitude of the acceleration of the car is
A) decreasing. B) increasing. C) non-zero constant. D) zero. E) None of the other choices is correct.
On the H-R diagram, 90 percent of all stars are _______________
Fill in the blank(s) with correct word