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PHY101 Physics Assignment 2 Solution Spring 2013

Question # 1
Is it true or wrong that a point on a wheel rotates from 12 o’clock to 3 o’clock, so its angular
displacement is 90 degrees? If yes explain it if no write its reason. Marks = 4

 Solution: it true  that a point on a wheel rotates from 12 o’clock to 3 o’clock, so its angular displacement is 90 degrees. In one rotation ,wheel rotates 360 degrees.So In twelve hours  a point.

Question # 2
A potter’s wheel rotates. A location farther from the axis will have a greater angular velocity than one closer to the axis. Either yes or no explain in each case. Marks = 5

 

Question # 3
a. Can you write the basic reason of resonance? Is there any role of natural frequency in this phenomenon or not?
b. Generally it is accepted about the slope at any point on the displacement graph of an object in SHM (Simple Harmonic Motion) is its velocity. Are you agree it or not?

 

Question # 4
I have a baseball bat. I shave off some weight from the handle and put it on the head of the bat. A
baseball player thinks I have changed the bat’s moment of inertia. Is he right? Marks = 4
Question # 4
a. Is it true to consider ‘torque’ as a ‘force’? Give its explanation.
b. A torque that causes counterclockwise acceleration is a positive torque or negative.

 

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