Question

20 g of hotwater. at 80 Celsius is poured into 60g of Coldwater , when the temperature of Coldwater rises by 20 Celsius. calculate the initial Temperature of Coldwater​

Answer 1

Answer:

Heat gained by cold water = Heat loss by hot water

mSΔT = m’SΔT’

m ΔT = m’ ΔT’

600 g × 15 °C = 300 g × ΔT’

ΔT’ = 30 °C

Change in temperature of hot water is 30°C

30°C = 50°C - T ………[∵ Initial Temperature of water was 50°C]

T = 20°C

Final temperature of hot water = Temperature of mixture = 20°C

Given that,

Rise in temperature of cold water = 15°C

20°C - T’ = 15°C

T’ = 5°C

∴ Initial Temperature of cold water is 5°C

Answer 2

Answer:

I think 5°c I'm not confirm but the formula of initial temperature is final temperature - change in temperature