A plank with a box on it at one end is g...

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches `30^(@)` , the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be repectively.

0.5 and 0.6

0.4 and 0.3

0.6 and d0.6

0.6 and 0.5

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A plank with a box on it at one end is gradully raised about the other end. As the angle of inclination with the horizntal reaches 30^(@) , the box starts to slip and slide 4.0m down the plank in 4.0s . The coefficients of static and knitic friction between the box and the plank will be, respectively.

A block slides down an inclined surface of inclination 30^0 with the horizontal. Starting from rest it covers 8 m in the first two seconds. Find the coefficietn of kinetic friction between the two.

A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18^@ with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15^@ . Find the coefficients of static and kinetic friction between the block and the plank.

Determine the maximum horizontal force F that may be applied to the plank of mass m for which the solid sphere does not slip as it begins to roll on the plank. The sphere has a mass M and radius R . The coefficient of static and kinetic friction between the sphere and the plank are mu_(S) and mu_(k) respectively.

A mass of 4 kg rest on a horizontal plane . The plane is gradually inclined until an angle 0 = 15^(@) with the horizontal and the mass just begins to slide . What is the coefficient of static friction between the block and the surface ?

A box when dropped from a certain height reaches the ground with a speed ν. When it slides from rest from the same height down a rough inclined plane inclined at an angle 45^(@) to the horizontal, it reaches the ground with a speed ν//3 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 ms^(-2))

A minimum force F is applied to a block of mass 102 kg to prevent it from sliding on a plane with an inclination angle 30^(@) with the horizontal. If the coefficients of static and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the force F is

A block of mass 4kg rests on a rough horizontal plane. The plane is gradually inclined until at an angle theta=60^(@) , with the vertical, the mass just begins to side. What is the coefficient of static friction between the block and the plane?

A long plank begins to move at t=0 and accelerates along a straight track wit a speed given by v=2t^(2) for 0le t le 2 (where v is in m/s and t is in second). After 2 sec the plane continues to move at the constant speed acquired. A small initially at rest on the plank begins to slip at t=1 sec and stops sliding at t=3 sec. If the coefficient of static friction and kinetic friction between the plank and the block is 0.s and 0.k (where s and k are digits) respectively, find s+k (take g=10m//s^(2) )

A rectangular box lies on a rough inclined surface . The coefficient of friction between the surface and the box is mu . Let the mass of the box be m . (a) At what angle of inclination theta of the plane to the horizontal will the box just start to slide down the plane ? (b) What is the force acting on the box down the plane , if the angle of inclination of the plane is increased to alpha gt theta ? (c) What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed ? (d) What is the force needed to be applied upwards along the plane to make the box move up the plane with acceleration a ?

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