P117 Week 10 WS1- Tuesday, November 14, 2017 12 The two systems below consist ea

Question

P117 Week 10 WS1- Tuesday, November 14, 2017 12 The two systems below consist each of two masses connected by a massless rod. Forces act in perpendicular direction to the masses at all times causing a torque. Calculate the angular velocity in the two cas at t = 2.0 s. Assume that the systems are both at rest at t = 0s. R10. esi 1 I N I N 2 kg 2kg 2 m 2 kg 2 kg 1 N IN 10.8 Work and Power for Rotational Motion. Start by looking at the blue box on page 525. The work-kinetic energy expression is the same for linear and rotational motion, but vou have to use the kinetic eneray for rotations Equation

Explanation / Answer

Here , for the left figure

for the angular speed w at t = 2 s

I * w = torque * time

(2 * 2^2 + 2 * 2^2)* w = 1 * 4 * 2

w = 0.50 rad/s

the angular speed is 0.50 rad/s

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for the right figure

for the angular speed w at t = 2 s

I * w = torque * time

(2 * 1^2 + 2 * 1^2)* w = 1 * 1 * 2

w = 0.50 rad/s

the angular speed is 0.50 rad/s

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