Lesson: Work and Power for Rotational MotionPhysics
In this lesson, we will learn how to apply the work–energy theorem and principle of energy conservation using the quantities associated with rotational motion.
Sample Question Videos
A wind turbine rotates at 20 rpm. If its power output is 2.0 MW, what is the torque produced on the turbine from the wind?
A uniform cylindrical grindstone has a mass of 10 kg and a radius of 12 cm.
What is the rotational kinetic energy of the grindstone when it is rotating at rpm?
After the grindstone’s motor is turned off, a knife blade is pressed against the outer edge of the grindstone with a perpendicular force of 5.0 N. The coefficient of kinetic friction between the grindstone and the blade is 0.80. Use the work energy theorem to determine how many turns the grindstone makes before it stops.
A propeller is accelerated from rest to an angular velocity of 1,000 rpm over a period of 6.00 seconds by a constant torque of N⋅m.
What is the moment of inertia of the propeller?
What power is being provided to the propeller 3.00 s after it starts rotating?