9. During an isothermal compression of 1 mol of ideal gas from a volume of 22.4 L at 0°C to a volume of 16.8 L, (Gas constant R=8.31 J/mol·K.) The work done by an external agent is (A)0 J (B)326 J (C)653 J (D)979 J (E)1306 J

3. A spherical shell has inner radius R₁, outer radius R₂, and mass M, distributed uniformly throughout the shell. The magnitude of the gravitational force exerted on the shell by a point particle of mass m located a distance d from the center, outside the inner radius and inside the outer radius, is: (A)0 (B)GMm/d² (C)GMm/(R₂²-R₁³) (D)GMm(d³-R₁³)/d²(R₂³-R₁³) (E)GMm/(d²-R₁²)

9. During an isothermal compression of 1 mol of ideal gas from a volume of 22.4 L at 0°C to a volume of 16.8 L, (Gas constant R=8.31 J/mol·K.) The work done by an external agent is
(A)0 J
(B)326 J
(C)653 J
(D)979 J
(E)1306 J

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