Question

ANSWER AS FAST AS POSSIBLE.(CORRECTLY)

Answer 1

Given :

height of the waterfall ( h ) = 50 m

Initial temperature ( t₁ ) = 15°C

Heat energy = kinetic energy of the water

Heat energy = m c Δ t

Kinetic energy = m g h

Hence we get :

m c Δ t = m g h

Cancel m both sides :

==> c Δ t = g h

We know that c of water is 4.2 cal / g °C

Also : Δ t = t - t₁

So : 4.2 × Δ t  = 10 × 50

==> Δ t  = 500 / 4.2

==> Δ t = 5000 / 42

==>Δ t = 134.047

The change in temperature is 134.05 K

Hope it helps !

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