Two stones each of mass 5kg fall on a wheel from a height of 10m. The wheel stirs 2kg water. The rise in temperature of water would be
For the given condition potential energy of the two masses will convert into heat and temperature of water will increase W=JQ⇒2m×g×h=J(mw SΔt)⇒2×5×10×10=4.2(2×103×Δt)
∴Δt=10008.4×103=0.119∘=0.12∘C