What is the mean free path of molecules in an ideal gas in which the mean collision time is 3.00 × 10-10 s, the temperature is 300 K, and the mass of the molecules is 6.00 × 10-25 kg?
A)
7.22 × 10-8 m
B)
4.32 × 10-8 m
C)
9.19 × 10-8 m
D)
1.39 × 10-8 m
E)
6.71 × 10-8 m
B
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Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. While you are lifting, the net force on the book is
A) less than 12 N, by an amount that depends on the speed of lifting. B) more than 12 N, by an amount that depends on the speed of lifting. C) 12 N directed upward. D) zero. E) 12 N directed downward.
You perform Compton scattering experiments with X-rays of a fixed wavelength. In one experiment you scatter the X-rays from free electrons. In the second experiment you scatter the X-rays from protons instead
For X-rays scattered under a given angle, the wavelength change A) will be larger for scattering from protons. B) will be the same for both cases. C) will be larger for scattering from electrons. D) depends on the actual wavelength of the X-rays.
Support reaction Gy in the frame below is:
(A) 1.83P
(B) 2.05P
(C) 2.75P
(D) 21.77P
In an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much work is done by the gas during this process?
A) -25 J B) -50 J C) 0 J D) 50 J E) 25 J