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Mechanical Properties of Fluids
Question
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Why does an object entering the earth’s atmosphere at high speed catch fire?

Answer

When an object moving at a high speed and enters the Earth's atmosphere, kinetic energy of body is converted into heat. The viscosity of ar is high in te Earth's atmosphere. Hence, a high apeed object catches fire. 

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Some More Questions From Mechanical Properties of Fluids Chapter

Why solids have definite shape while liquids do not have definite shape?

What is fluid?

What is hydrostatics?

What is hydrodynamics?

Can fluids withstand tangential stress?

Can fluids withstand normal stress?

Why the fluids do not have any modulus of rigidity?

Which phase of fluid is more compressible?

What is an ideal liquid?

Do liquids exert pressure?