A block of mass 2 kg is pulled up on a smooth incline making angle 30 degrees with horizontal . If block moves with an acceleration of 1 m/s2 , find a) Power delivered by the pulling force at a time 4 sec after motion starts b)average power deliverd after 4 sec the motion starts ***MY DOUBT I...

The roof of a tall building is 25m above the ground.it strikes the concrete floor on the ground with velocityV1.it bounces to a maximum height of 6m.the ball was in contact with the floor for 0.9s.wht is the velocity of v1 when the ball hits the floor? And what was the impulse of the ball as a...

Rowan and jean are tobogganing on an old pasture with rolling hills. At A the hill is 14m high; at B, 2.8m, at A, the toboggan is just beginning to slide. a)if there is no loss of mechanical energy, what is the velocity of the toboggan at B? b) if 25% of the mechanical energy at A is lost by B,...

caculate the number of revolutions of the shaft required to raise a load through 1.2m. Diameter of the shaft=10.0m mass of the load=0.5kg time taken to raise the load through 1.2m=5.0s assuming that the thickness of the thread can be ignored and that the gravitational force acting on a mass of...