Question

A boiler is made of 3mm thick copper plate .The inner surface of the plate is coated with a layer of tin of thickness 0.3mm.The surface of the plate is 150cm^2.The outside temperature of the copper plate is 700degree centigrate .Find the maximum amount of os steam that can be produced per hour at atmospheric pressure.The coefficient of thermal conductivities of copper and tin are 397Wmk-¹ and 63Wmk-¹.​

Answer 1

Explanation:

10. A 100 g steel ball falls from a height of 1.8 m on to a metal plate and rebounds to a height of 1.25 m. Find:

a. the p.e. of the ball before the fall (g = 10 m/s 2 ),

b. its k.e. as it hits the plate, c

c. its velocity on hitting the plate,

d. its k.e. as it leaves the plate on the rebound,

e. its velocity of rebound.