You have a hoop that is 10 cm in radius that you need to measure the mass of. You do not have a scale, but you do have a solid disk with a radius of 12 cm and a known mass of 5 kg, and you have a device that will measure rotational speed. You set the disk on a platform, give it a spin so that it is rotating clockwise at 30 rad/s, then set the hoop on the disk. Afterwards, the system is rotating at 20 rad/s. What is the mass of the hoop? Thank you

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.