Categories: Physics JAMB

A piece of substance of specific heat capacity 450Jkg‾¹k¹ 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 = 10ms‾²]

A. 2/9ºC
B. 4/9ºC
C. 9/2ºC
D. 9/4ºC

Correct Answer:

Option B = 4/9ºC
Explanation

Using the law of conservation of energy

mc△θ = mgh

△θ = gh/c=10×20/450 = 4/9ºC

 

SEE ALSO An object is placed 5 cm from the pole of a concave mirror. If the focal length of the mirror is 10 cm. What is the image distance?
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