7. What is roughly the mean free path for oxygen molecules at temperature of 300 K and pressure of 1.0 atm? Assume that molecular diameter is 0.3 nm and the gas is ideal. (A) 100 (B) 200 (C) 300 (D) 400 [nm]

4. A point-like bug of mass m lies on the rim of a uniform disk of mass M that can rotate freely about its center. Initially the bug and disk rotate together with an angular velocity ω₀. Then the bug walks half way to the center of the disk. What is ratio of the new kinetic energy of the system to its initial kinetic energy? (A) (4m+2M)/(m+2M) (B) (m+2M)/(4m+2M) (C) (2m+4M)/(2m+M) (D) (2m+M)/(2m+4M)

7. What is roughly the mean free path for oxygen molecules at temperature of 300 K and pressure of 1.0 atm? Assume that molecular diameter is 0.3 nm and the gas is ideal.
(A) 100
(B) 200
(C) 300
(D) 400 [nm]

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