Physical independence of force is a consequence of 

A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift.The machine reads his weight in Newtons.What is the reading of the machine if the lift is moving upwards with a uniform speed of 10 m/sec²?

(g = 10 m/sec² )

If the force on a rocket moving with a velocity of 300 m/s is 345 N, then the rate of combustion of the fuel ,is 

Two iron blocks of equal mass but with double surface area slide down an inclined plane with friction coefficient μ.If the first block with surface area A experience a frictional force f, then the second block with surface area 2A will experience a frictional force

A body is placed on an inclined plane and has to be pushed down.The angle made by the normal reaction with the vertical will be

An air craft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15° .What is the radius of the loop?

A 600 kg rocket is set for a vertical firing.If the exhaust speed is 1000 m/s,the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is

The rear side of a truck is open and a box of 50 kg mass is placed 5 m away from the rear end.The coefficient of friction between the box and the surface below it is 0.15.On a straight road the truck starts from rest and accelerates at 2 m/s² .At what distance from the starting point does the box fall off the truck ?(g = 10 m/s² )

A car turns a corner on a slippery road at a constant speed of 12 m/s. If the coefficient of friction if 0.4, the minimum radius of the arc is metre in which the car turns is

A block of mass 10 kg is placed on a rough horizontal surface whose coeffecient of friction is 0.5.If a horizontal force of 100 N is applied on it,then acceleration of block will be :