1. a certain cd has a playing time of 74 minutes. when the music starts, the cd is rotating at an angular speed of 4.70×10(2) revolutions per minute (rpm). at the end of the music, the cd is rotating at 2.40×10(2) rpm. find the magnitude of the average angular acceleration of the cd. express your answer in rad/s².
2.the pedals of a bicycle rotate in a circle with a diameter of 40 cm. what is the maximum torque a 64-kilogram rider can apply by putting all of her weight on one pedal?

1.

Explanation:

Initial angular speed of the CD is given as

Similarly final angular speed is given as

now angular acceleration is given as

2.

Explanation:

As we know that torque is the product of force and its distance from the axis of rotation

so we will have

so we have

now we have

the higher the current the higher the mag field around it the higher the influence on the compass

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.