A force of 50 kg is requird to pull a roller weighing 500 kg over ice.What is ceofficient of friction?

A body weighing 20 kg just slides down a rough inclined plane that rises 5 m in every 12 m.What is the coefficeint of friction?

A block of mass 1 kg is pushed up a surface inclined to horizontal at ang angle of 30^@ by a force of 10 N parallel to the inclined surface in the figure. shows . The coefficient of friction between bock and the incline is 0.1. If the block is pushed up by 10 m along the incline, calculate work done against force of friction

A block of mass 1 kg is pushed up a surface inclined to horizontal at ang angle of 30^@ by a force of 10 N parallel to the inclined surface in the figure. shows . The coefficient of friction between bock and the incline is 0.1. If the block is pushed up by 10 m along the incline, calculate work done by applied force.

A force of 3 kg weight is just sufficient to pull a block of 4 kg over a horizontal surface.What is the angle of friction?

A stone of 1 kg is thrown with a velocity of 20 ms^( -1) across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice ?

A mass of 4 kg rests on a horizontal plane. The plane is gradually inclined at an angle theta = 15^@ with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?

A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m s^-2 . The crew and the passengers weigh 300 kg. Give the magnitude and direction of the:- force on the floor by the crew and passengers,

A coper block of mass 2.5 kg is heated in a furnace to a temperature of 500 ^@C and then placed on a large ice block. What is the maximum amount of ice that can melt? (specific heat of copper = 0.39 J g^-1 C^-1 , heat of fusion of watter = 335 J g^-1 ).