A solid disk with a radius of #5 m# and mass of #4 kg# is rotating on a frictionless surface. If #3 W# of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at #4 Hz#?

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Answer 1 · 2017-11-11T01:43:13

#"0.12 Nm"# of Torque was applied on the disc.

#"Power = Torque × Angular Velocity"#

#"Torque" = "Power" / "Angular Velocity" = ("3 Watt") / ("2 π × 4 Hz") = "0.12 Nm"#