A railway carriage of mass 10 kg is moving with a speed of 45 km/hr on a circular track of radius 400m. If the rails are 1.5m apart, find by how much the outer rail should be raised over the inner rail so that there is no side thrust on the rails.

A circular track of radius 600m is to be designed for cars moving at an average speed of 180km/hr. what should be the angle of banking of track. Take g = 10 m/sec^2 .

A mass of 4kg is hung from a metal wire of radius 0.5 mm and length 3m. Find the extension produced in the wire. What should be minimum radius of the wire so that the elastic limit of 20 xx 10^7 N/m^2 of the metal wire is not exceeded ? Y=20x10^10N/m^2.

The electron in the first orbit of hydrogen atom revolves round the nucleus in a circular orbit of radius 0.5 overset@A with a speed 2.18xx10^(6) m/s . What is the centripetal force acting on the electron ? (Mass of electron = 9.1xx10^(-31) kg).