In the arrangement shown in figure, coefficient of friction between the two blocks is . The force of friction acting between the two blocks is
1. 8 N
2. 10 N
3. 6 N
4. 4 N
(d) none of these
A hemispherical bowl of radius R is rotated about its axis of symmetry which is kept vertical with angular velocity . A small block is kept in the bowl. It remains stationary relative to the bowl surface at a position where the radius makes an angle with the vertical. The friction is absent. The value of is :-
4. None of these
What is the frictional force acting on the block B?
2. 10 N
3. 50 N
4. 60 N
A cart of mass M has a block of mass m attached to it as shown in the figure. The coefficient of friction between the block and cart is . What is the minimum acceleration of the cart so that the block m does not fall?
A box 'A' is lying on the horizontal floor of the compartment of a train running along horizontal rails from left to right. At time 't' the train decelerates. Then the resultant contact force R by the floor on the box is given best by :