Question

Water falls from a height of 210 m. Assuming whole of energy due to fall is converted into heat the rise in temperature of water would be (J = 4.3 Joule/cal)

• A.
• B.
  
• C.
  
• D.
  

Answer 1

The correct option is C


Loss in potential energy of water = Increment in thermal energy of water
$\Rightarrow mgh=J\times ms\Delta t\Rightarrow 9.8\times 210=4.3\times 1000\Delta t\therefore \Delta t={0.49}^{\circ }C$