Determine the minimum force p to prevent the 25-kg rod ab from sliding. the contact surface at b is smooth, whereas the coefficient of static friction between the rod and the wall at a is μs = 0.17.

108.65 N

Explanation:

given,

mass of road = 25 Kg

static friction at A = 0.17

contact force at B

there will a normal force acting at point A i.e Na and a friction force in the vertical direction at Point A i.e. μNa

A horizontal force is acting along point B i.e N_b.

At the middle weight of of the rod will be acting i.e mg at  2 m

diagram attached below shows the forces,

now, taking moment about point B

computing horizontal forces

Na= 108.65 N

now,

computing horizontal forces

P = N_a

P = 108.65 N

hence, P is the contact force at point B

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explanation:

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explanation: