Two wheels have the same mass and radius of 4.4 kg and 0.48 m, respectively. one has (a) the shape of a hoop and the other (b) the shape of a solid disk. the wheels start from rest and have a constant angular acceleration with respect to a rotational axis that is perpendicular to the plane of the wheel at its center. each turns through an angle of 14 rad in 8.0 s. find the net external torque that acts on each wheel.

1)

2)

Explanation:

Using the second equation of angular motion we have

Since the wheels start from rest we ahve

Applying the given values in the equation we have

Now by newton's second law of motion in angular motion we have

1) For Hoop We have

Thus  

2)For disc We have

Thus  

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.