2-2.
A 50 kg crate is placed on the ground, and the coefficient of the kinetic
friction between the crate and the ground is . If
the
motor draws in the cable with a velocity
, where
follows a normal distribution
and
is in
seconds, determine the time when the probability that the cable beaks is 0.05. Assume
that
and
are
independent, and the maximum tension the
cable can stand is
.
Solution: