Mechanics | Relativity Answers

1) A lorry driver pushes of horizontal with a speed of 20m/s from the edge of a platform that is 10m above, the surface of the water.(a)at what horizontal distance from the edge of the platform is the driver 0.80sec after pushing off. (b) at what vertical distance above the surface of the water is the driver just then.(c) at what horizontal distance from the platform does the driver strike the way.
2) An astronaut is located in an horizontal centrifuge at a radius of 50m.(a)what is the astronaut speed if the centripetal acceleration has magnitude of 7.0g (b) what is the period of the motion

An automobile traveling at 80km/hr has tyre of radius 80cm .on applying brakes the car is brought to a stop in30 complete turns of tyres.what is the magnitude of the angular acceleration of the wheels

A satellite going around the earth in an elliptical orbit has a speed of 10 km/s at the perigee which is at a distance of 227 km from the surface of the earth. Calculate the apogee distance &its speed at that point.

A proton undergoes a head on elastic collision with a particle of unknown mass which is initially at rest and rebound with 16/25 of its initial kinetic energy.Calculate the ratio of the unknown mass with respect to the mass of the proton.

A solid cylinder of mass 3 kg and radius 1 m is rotating about its axis with a speed of 40 rad/s . Calculate the torque which must be applied to bring it to rest in 10 second. What would be the power required?

A road heading due east passes over a small hill. You drive a car of mass m at constant speed v over the top of the hill, where the shape of the roadway is well approximated as an arc of a circle with radius R. Sensors have been placed on the road surface there to measure the downward force that cars exert on the surface at various speeds. The table gives values of this force versus speed for your car is shown in the table below. Treat the car as a particle.


Speed (m/s) 6.00 8.00 10.0 12.0 14.0 16.0
Force (N) 8100 7690 7050 6100 5200 4200

why the chain of bicycle connected to the back wheel instead of front wheel

a 2m long string vibrates in 4 loops at 50Hz. linear density of the string is 0.0004gm/cm. caculate the tension in a string.

A block of mass 1.00 K.g rests on a horizontal surfaces. A force of 0.500 K.g is required to start the block into motion. Compute the coefficient of friction.

A body starts from rest what are the change of equation for that body?