A merry-go-round on a playground consists of a horizontal solid disk with a weight of 805 N and a radius of 1.47 m. A child applies a force 49.0 N tangentially to the edge of the disk to start it from rest. What is the kinetic energy of the merry-go-round disk (in J) after 2.95 s?

255.34 J

Explanation:

Given,

Weight of disk = 805 N

radius = 1.47 m

Force applied by the child = 49 N

time = 2.95 s

KE = ?

mass of the disk

Moment of inertia of the disk

Torque on the child

Angular acceleration

So, angular speed at t = 2.95 s

Now, KE of the merry go round

Hence, the Kinetic energy of the merry go round = 255.34 J

would be false hope this out

6 cos 34, 6 sin 34 trig