An automobile engine slows down from 4500 rpm to 1200 rpm in 2.5 s. Calculate (a) its angular acceleration, assumed constant, and (b) the total number of revolutions the engine makes in this time.

Solution: The uniform material in the above figure we need to find what is the greatest that x can be without the object tipping over Step 1 Where the centre of gravity depends on the distances x , x , of each particle o f mass m , 1 2 1 m ,2from the origin. x m + x m + x m + .. x = 1 1 2 2 3 3 cg m +1m + 2 + .3 xcgis the centre of gravity, The density of the substance or material is defined as the mass (m) and volume (V). m = V Therefore, the mass of the substance can be written as, m = V Step 2 The uniform of the material in the object as shown in the figure, C.g = centre of gravity