A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. What is the size of the image formed?
A. 5.0 cm
B. 7.2 cm
C. 7.5 cm
D. 30 cm
E. 12 cm
A. 5.0 cm
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The force exerted on the tires of a car that directly accelerate it along a road is exerted by the
A) engine. B) tires. C) air. D) road. E) none of the above
A certain ideal gas has a molar specific heat at constant pressure of 7R/2. What is its molar specific heat at constant volume?
A) 5R/2 B) 3R/2 C) 8R D) 9R/2 E) 6R
Which of the following is a unit of power?
a. Btu b. kilowatt c. kilowatt-hour d. joule e. horsepower per hour
The diameter of wire A is greater than the diameter of wire B, but their lengths and resistivities are identical. For a given voltage difference across the ends, what is the relationship between PA and PB, the dissipated power for wires A and B, respectively?
1. PA = PB 2. PA < PB 3. PA > PB