Mechanics | Relativity Answers

A ball moving with speed v collides with a horizontal smooth surface at an angle theta with normal to surface as shown in the figure. If coefficient of restitution is ‘e’ , then find velocity after it re-bounces making same angle theta with the normal.

A student attaches a rope to a 20.0 kg box of books. He pulls with a force of 90.0 N at an
angle of 30.0° with the horizontal and walks to the left. The coefficient of kinetic friction
between the box and the sidewalk is 0.500. Find the acceleration of the box.

A uniform rod has mass m and length L. One end of the rod is attached to a fixed point O by a hinge and an additional force F is applied to the other end of the rod in the vertical direction(upwards). Given that the rod is in mechanical equilibrium, what is the magnitude of the applied force F, expressed as a numerical mutiple of mg, where g is the magnitude of the acceleration due to gravity? (To 3 significant figures).

A boy starts from rest and accelerates at 3 m/s², for four seconds. Its velocity remains constant at the maximum value so reached for seven seconds. and it finally comes to rest with uniform retardation after another five seconds. What is the distance moved during each stage of the motion?

Train breaks are applied it has covered covered 800 m distance reducing speed from 96km/h to 48km/h before going going to rest how much distance it covered.

a train at rest start moving with uniform acceleration 2 min reach 48kmh after 5 min it uniform retardation and start after 3 min.how much distance it covered

250N force is required to raise 75 kg mass from a pulley.if rope is pulled 12m then load is lifted to 3m,the efficiency of pulley system will be

A Car Of Uniform Velocity 25 m/Sec Moving Behind A Motorcycle Of Uniform velocity 20 m/sec
If The Distance Between Them Is 360 ,Calculate The Time Elapsed For The Car To Overtake The Motorcycle .

Q: A body weighing 2 kg tied at the end of string 1 meter long and rotating in a vertical circular path at a speed of 6 meter per second. What is the tension at the string at top and at bottom?

what are forces acting on a body in vertical circular motion?