A book of weight `20N` is pressed between two hands and each hand exerts a force of `40N`. If the block just starts to slide down Coefficient of friction is .

A student holds a book of mass 2kg between his hands.Each hand exerts horizontally a force of 50N .Then the coefficient of static friction is

A block of mass 1kg is pressed against a wall by applying a horizontal force of 10N on the block. If the coefficient of friction between the block and the wall is 0.5 ,magnitude of the frictional force acting on the block is

A block of 50 N is pressed normally against a wall as shown. The frictional force acting on the block is : ]

A man holds a 2 kg book between his palms so that each hand exerts the same horizontal force on the book.The coefficient of static friction between the palms and the book is 0.4 and g= 10m s^(-2) .If the book is prevented from falling,the least force exerted by each hand on the book is ?

A block of weight 30 N is in contact with a rough wall. A force of 50 N is applied as shown in the figure. Find the coefficient of static friction between the wall and the block assuming the block is just about to slip.

A20 kg block is initally at rest. A 75 N force is required to set the block in motion. After the motion starts, a force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A block of mass 10 kg is placed on an inclined plane when the angle of inclination is 30^(@) . The block just begins to slide down the plane. The force of static friction is

Given in figure are two blocks A and B of weight 20N and 100N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is: