A constant force of 40 N is applied tangentially to the rim of wheel 20 cm in radius. the wheel has a moment of inertia of 30 kg-m2 find (a)The angular acceleration (b)The angular speed after 4 sec from rest (c)The number revolution made in the 4 sec (d)show that the work done on the wheel in the 4 sec is equal to Ek of the wheel after 4 sec.