Amerry-go-round on a playground consists of a horizontal solid disk with a weight of 810 n and a radius of 1.48 m. a child applies a force 50.5 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 3.05 s?

Kinetic energy will be equal to 99.13 J

Explanation:

We have given weight w = 810 N

Radius r = 1.48 m

Time t = 3.05 sec

Acceleration due to gravity

We know that weight is equal to

So

m = 82.65 kg

We know torque , here I is moment of inertia

Moment of inertia is given by

So

We have given initial angular velocity

So

Now rotational kinetic energy is given by

an energy transformation flow diagram is shown

where is it ?

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