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Mechanical Properties of Fluids
Question
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What are thermal radiations?

Answer

The energy emitted in the form of radiation by a body due to its temperature is called thermal radiations. 
Thermal radiations produce a sensation of warmth. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What is temperature coefficient?

What is periodic motion?

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?