A rod OA rotates about a horizontal axis through O with a constant anti-clockwise velocity `omega=3 rad//s.` As it pases the positions `theta=0^(@)` a small block of mass m is placed on it at a radial distacne r=450 mm If the block is observed to slip at `theta=50^(@)` the coefficient of static friction bewteen the block and the rod is (Given that ,`sin50^(@)=0766,cos 50^(@)=0.64`)

A rod OA rotates about a horizontal axis through O with a constant aniclockwise velocity omega = 3 red s^(-1) . As it passes the position theta = 0 , a small block of mass m is placed on it at a radial distance r = 450 mm if the block is observed to slip at theta = 50^(@) . Find the coefficient of static friction between the block and the rot (Given that sin 50^(@) = 0.766, cos 50^(@) = 0.64)

A rod OA rotates about a horizontal axis through O with a constant aniclockwise velocity omega = 3 red s^(-1) . As it passes the position theta = 0 , a small block of mass m is placed on it at a radial distance r = 450 mm if the block is observed to slip at theta = 50^(@) . Find the coefficient of static friction between the block and the rot (Given that sin 50^(@) = 0.766, cos 50^(@) = 0.64)

A wooden plank OA rotates in vertical plane about horizontal axis through O with a constant angular velocity omega = 3 rad/s . As it passes the position theta = 0 , a small mass m is placed upon it at a radial distance r = 0*5 m . If the mass m starts sliding at theta = 37^(@) , find the coefficient of friction between mass and the plane .

The inclined plane OA rotates in vertical plane about a horizontal axis through O with a constant counter clockwise velocity omega=3 rad/sec. As it passes the position theta=0 , a small m=1 kg is placed upon it at a radial distance r=0.5 m. if the mass is observed to be at rest with respect to inclined plane. The value of static friction force at theta=37^(@) between the mass and the incline plane

The inclined plane OA rotates in vertical plane about a horizontal axis through O with a constant counter clockwise velocity omega=3 rad/sec. As it passes the position theta=0 , a small m=1 kg is placed upon it at a radial distance r=0.5 m. if the mass is observed to be at rest with respect to inclined plane. The value of static friction force at theta=37^(@) between the mass and the incline plane

A plank is rotating in a vertical plane about one of its ends with a constant angular velocity omega=sqrt(2)rad//s . A block of mass m=2kg is placed at a distance l=1m from its end A (see figure) which is hinged. The block starts sliding down when the plank makes an angle theta=30^(@) with the horizontal. If coefficient of friction between the plank and the block is mu and given that mu^(2)=k//25 . Find the value of k .

A homogeneous disc of weight W and radius R rotates about the vertical axis OZ, the initial angular velocity being omega_(0) . During the motion, the brake block A is pressed to the disc,with a radial force N for t_(0) seconds and the disc comes to rest because of friction. Find the coefficient of friction.

A block of mass 50 kg slides over a horizontal distance of 1m. If the coefficient of friction between their surface is 0.2, then work done against friction is (take g = 9.8 m//s^(2) ) :