A motorcyclist of mass m is to negotiate a curve of radius r with a speed v . The minimum value of the coefficient of friction so that this negotiation may take place safely, is

A pick up van negotiates an unbanked curve of radius 40 m with a crate of eggs in the middle of its flat bed. If the coefficient of static friction between the crate and the truck, is 0.55 what is the maximum speed the van can take, so that the crate does not slide ?

A motorcyclist is describing a circle of radius 25 m at a speed of 5 m/s . Find the inclination with the vertical and the coefficient of friction between the tyres and ground.

A car of mass 1000 kg is negotiating an unbanked curve of radius 20 m. If the coefficient of friction is 0.5 and g = 10 m//s^(2) the maximum safe speed of the car is