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A piece of substance of specific heat capacity 450Jk...

A piece of substance of specific heat capacity 450Jkg1k1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms2]

 

A.

29ºC

B.

49ºC

C.

92ºC

D.

94ºC

Correct answer is B

Using the law of conservation of energy

mcθ = mgh

θ = ghc=10×20450=49ºC