A wet socks clinging to the inside of a washing machine drum which is spinning at a speed of
4.7 m/s. The radius of the drum is 30 cm.
(a) (Marks: 2) What is the minimum coefficient of static friction
between sock and the drum so that the sock will not slip down?
(b) (Marks: 1) At the same rotational speed and coefficient of
static friction between sock and the drum, would a sock of twice
the mass slide down the wall? Explain your answer.
(c) (Marks: 2) As the drum slows down after the washing is done
at an angular retardation of 3.25 rad/sec2
The Newton’s second law equation
The minimum coefficient of static friction is 0.133
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