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Mechanical Properties Of Fluids

Question

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A piece of paper wrapped tightly on a wooden rod is found to get burnt when held over a flame, but similar piece of paper when wrapped around a brass rod does not burn, why?

Solution

Wood is a bad conductor and brass is a good conductor of heat.
When a paper is wrapped around wood and is held over a flame, a sufficient quantity of heat supplied to it resides in the paper. Therefore the paper gets burnt.
On the other hand, if the paper is wrapped around the brass rod, the heat supplied to paper gets conducted into the interior of metal rod and hence the paper wound over metal rod does not get burnt.

Some More Questions From Mechanical Properties of Fluids Chapter

What is an oscillatory motion?

What is time period?

Define frequency.

What is the condition for motion to be simple harmonic motion?

In the displacement equation y = r sin(ωt/ + ϕ) what does ϕ called and what information does it give?

What determines the natural frequency of an oscillator?

Is there any relation between uniform circular motion and simple harmonic motion?

What is periodic motion?

Write down the expression for the instantaneous velocity and acceleration of particle vibrating in simple harmonic motion.

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