A rotating flywheel can be used as a method to store energy. If it is required that such a device be able to store up to a maximum of 2.00 × 10^6 J when rotating at 400 rad/s, what moment of inertia is required?
a. 50.0 kg m2 b. 25.0 kg m2
c. 12.5 kg m2 d. 6.30 kg m2
b
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Molecular Speeds: What is the average translational kinetic energy of a nitrogen molecule in the air in a room in which the air temperature is 17°C? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 6.01 × 10-21 J B. 4.00 × 10-21 J C. 5.00 × 10-21 J D. 7.00 × 10-21 J E. 9.00 × 10-21 J
A conducting sphere of radius 20 cm has a charge Q placed on it producing a field of magnitude
at its surface. More charge is added to the surface until the magnitude of the field at the surface is 2
How much charge was added to the surface?
A. Q/2 B. Q C. 2 Q D. 1.4 Q E. 3 Q
A heat engine having the maximum possible efficiency has an efficiency of 35.0% when operating between two heat reservoirs. If the temperature of the hot reservoir is 700 K, what is the temperature of the cold reservoir?
A) 200 K B) 245 K C) 350 K D) 455 K E) 600 K
What is the average kinetic energy per molecule of an ideal gas at a temperature of 300 K? Boltzmann's constant is k = 1.38 × 10-23 J/K
A) 1.7 × 10-21 J B) 8.3 × 10-21 J C) 6.2 × 10-21 J D) 2.1 × 10-21 J E) 4.1 × 10-21 J