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. What is the total translational kinetic energy of the gas in a room filled with nitrogen at a pressure of 1.00 atm and a temperature of 20.7°C? The dimensions of the room are 4.60 m 5.20 m´8.80 m. Boltzmann constant 1.38 x 10-23 J/K, R 8.314 J/mol · K, and Na 6.02 x 1023 molecules/mol. (1 atm 1.013' 105 Pa) = = F = 1.70 x 10-20 j 1.13 x 10-17) 3.77 x 10-19 j X 3.19 107 5.65 x 10-21j

At a rock concert, a dB meter registered 124 dB when placed 2.5 m in front of a loudspeaker on stage. What is the sound level produced by the rock concert at 10 m, assuming uniform spherical spreading of the sound and neglecting absorption in the air? (10 = 1' 10-12 W/m2 is a reference intensity, usually taken to be at the threshold of hearing.) = a 109 dB 112 dB 129 dB 122 dB 119 dB

An object with mass 0.360-kg, attached to a spring with spring constant k = 10.0 N/m, is moving on a horizontal frictionless surface in simple harmonic motion of amplitude A 0.0820 m. What is the kinetic energy of the object at the instant when its displacement is x = = 0.0410 m? 0 0.013 J O 0.042J O 9.86 ) O 0.025 ) 0 2.46