A 4.0m long steel, beam with a cross-sectional area of 1.0 x10-2m² and a young's modulus of
2.0 x1011 N/m2 is wedged horizontally between
two vertical walls. In order to wedge the beam,
it is compressed by 0.020mm. If the coefficient
of static friction between the beam and the walls
is 0.70 the maximum mass (including its own) it
can bear without slipping is :
(1) O
(2) 3.6kg
(3) 36kg
(4) 710kg