Question

Some hot water is added to cold water. The mass of hot water is three times its mass of cold water at 10°C. The resulting temperature is found to be 20°C. Then the initial temperature of hot water is​

Answer 1

Answer:

the answer is 10°C

Explanation:

because 20° - 10°C =10°C ,

if hot water bigger than cold water so the difference is hot water

if cold water bigger than hot water so the difference is cold water

please mark me as the brilliant

Answer 2

Answer:

The answer is $\frac{70}{3}$°C.

Explanation:

We know that,

Energy lost by hot water = Energy gained by cold water

∴m(hot)sΔФ(1) = m(cold)sΔФ(2)

We also know that

m(hot) = 3.m(cold)

∴m(hot)(Ф-20)=m(cold)(20-10)

3× m(cold)(Ф-20) = m(cold)×10

3Ф-60 =10

3Ф = 70

Ф=$\frac{70}{3}$

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