A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

When the brakes in a car are applied, the frictional force force on the tyres is

If the stress on a wire is 10\(^7\)Nm\(^{-2}\) and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The Young's modulus of the wire is

A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

When temperature of a liquid increases, its surface tension