Under standard conditions helium fills up the space between two long coaxial cylinders. The mean...

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Under standard conditions helium fills up the space between two long coaxial cylinders. The mean radius of the cylinders is equal to \( R \), the gap between them is equal to \( \Delta R \), with \( \Delta R \ll R \). The outer cylinder rotates with a fairly low angular velocity \( \omega \) about the stationary inner cylinder. Find the moment of friction forces acting on a unit length of the inner cylinder. Down to what magnitude should the helium pressure be lowered (keeping the temperature constant) to decrease the sought moment of friction forces \( n=10 \) times if \( \Delta R=6 \mathrm{~mm} \) ?
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