The temperature of an ideal gas in a sealed 0.40 m3 container is reduced from 400 K to 270 K. The final pressure of the gas is 30 kPA. The molar heat capacity at constant volume of the gas is 28.0 J/mol • K. The work done by the gas is closest to
A) 0.00 kJ.
B) -19 kJ.
C) -25 kJ.
D) 19 kJ.
E) 25 kJ.
A
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A 3.0 kg object is moving to the right at 4.0 m/s. It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
A. 62 J B. 25 J C. 12 J D. 0.0 J
The EEF shown is incorrectly drawn because
A. It curves toward the axis in a forbidden region or away from the axis in an allowed region.
B. Its wavy part doesn’t have the right number of bumps.
C. The amplitude of the wavy part varies incorrectly.
D. The wavelength of the wavy part varies incorrectly.
E. One of the exponential-like tails has the wrong length.
A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s. What is the speed after the first 4.00 s of acceleration? (Hint: First convert the speed to m/s.)
a. 27.8 m/s b. 41.7 m/s c. 20.9 m/s d. 13.9 m/s e. 6.95 m/s
A very long string is tied to a rigid wall at one end while the other end is attached to a simple harmonic oscillator. Which of the following can be changed by changing the frequency of the oscillator?
a. The speed of the waves traveling along the string. b. The tension in the string. c. The wavelength of the waves on the string. d. All of the above. e. None of the above.