A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m.

Question

What is the tangential velocity, v, of the plane?
.

Answer 1

Well, you certainly don't need to know the mass to compute that.

Since is revolves at 8.09 rpm, the plane travels
2*pi*R*8.09 = 132.2 meters, tangentially (around the circle) in 60 seconds.

Take the ratio of those two numbers and you will have the speed in meters per second.

Answer 2

Thanks