The maximum acceleration of the train in which the box lying on its floor will remain stationary.The coeffecient of static friction is 0.15.

Two blocks P and Q are released at the top of a rough inclined plane so that P slides along the plane and Q falls down freely. Which will have higher velocity on reaching the ground?

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1:1:3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of heaviest fragment in m/s will be

A gramaphone record is revolving with an angular velocity ω. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is μ. The coin will revolve with the record if

What should be the tension in a rope pulling vertically upward a mass of 100 kg so that starting from rest it acquires a velocity of 4 m/s in 1.5 seconds?

Which of the following is the dimension of coefficient of friction?

 An army vehicle of mass 1000 kg is moving with a velocity of 10 m/s and is acted up or by a forward force of 1000N due to the engine and a retarding force of 500N due to friction. The velocity of it after 10 second is

A person sitting in an open car moving at constant velocity throws a ball vertically into air, the ball falls

A cylinder of mass 10 kg is rolling on a plane with an initial velocity of 10 m/s. If coefficient of friction between surface and cylinder is 0.5, then before stopping, the cylinder will cover a distance of

On the horizontal surface of a truck a block of mass 1 kg is placed (μ=0.6) and truck is moving with acceleration  5 m/sec², then the frictional force on the block will be