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**vibration problem!**

## Homework Statement

**Question**:

*There is a fixed end beam PQ. It is carrying a motor M. The motor is unbalanced and when the motor is rotating ,it is making the beam to vibrate with a frequency equal to the speed of the motor. A small mass is kept at point A just above the motor on the beam. it also goes up & down along with the beam . When the motor speed is 120 - 150rpm, the object at A is loosing contact with the beam & is actually dancing on the beam. Determine the amplitude of vibration when the speed of motor is 120 rpm and when 150 rpm . Then calculate the natural frequency of the system*.

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data may be suitably assumed.

## Homework Equations

can't get any of them

## The Attempt at a Solution

This is a base excitation problem. but the natural frequency is diff. to find. pls help

#### Attachments

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