A molecule in an ideal gas has an rms velocity 450 m/s. If the mean free path of the particle in the gas is 
then what is the average time between collisions?
a. 
b. 
c. 
d. 
e. 
a.
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A heat pump uses 100 J of work to output 150 J of heat at some temperature. What is the coefficient of performance for the heat pump?
A. 1.0 B. 1.5 C. 2.0 D. 2.5 E. 3.0
The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle ? above the floor. d. pushed by a force directed at an angle ? into the floor. e. turned on its side and pushed by a force parallel to the floor.
The solar wind is created in the Sun's ________.
A. corona B. convection zone C. radiation zone D. core
A 1.0 m long piece of coaxial cable has a wire with a radius of 1.1 mm and a concentric conductor with inner radius 1.3 mm. The area between the cable and the conductor is filled with a dielectric
If the voltage drop across the capacitor is 6000 V when the line charge density is 8.8 ?C/m, find the value of the dielectric constant. (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 4.4 B) 4.8 C) 5.3 D) 5.7