Question

Water falls from a height of 210m. 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. 42°C
• B. 49°C
• C. 0.49°C
• D. 4.9°C

Answer 1

Answer: (C)

0.49°C

Answer 2

$\Delta\theta = 0.0023h = 0.0023 \times 210 = 0.483{^\circ}C \approx 0.49{^\circ}C$.