A uniform wheel of 60 cm diameter and weighing 1000N rest against a rectangular block 15 cm high lying on a horizontal plane as shown in the figure. It is to be pulled over the block by a horizontal...

A uniform wheel of 60 cm diameter and weighing 1000N rest against a rectangular block 15 cm high lying on a horizontal  plane as shown in the figure. It is to be pulled over the block by a horizontal force p applied to the end of a string wound round the circumference of the wheel. Find the force P when the wheel is just about to roll over the block ?