Consider a rectangular block of wood moving with a velocity v_0 in a gas at temperature T and mass density ρ . Assume the velocity is along x-axis and the area of cross-section of the block perpendicular to v_0 is A. show that the drag force on the clock is 4rAv_0 √(kT/m), where, m is the mass of the gas molecule.

Q: Consider a rectangular block of wood moving with a velocity v_0 in a gas at temperature T and mass density ρ . Assume the velocity is along x-axis and the area of cross-section of the block perpendicular to v_0 is A. show that the drag force on the clock is $4rAv\sqrt{\frac{kT}{m}}$ , where, m is the mass of the gas molecule.