# MAJOR HELP NEEDED PLEASE Thermal Physics

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#1
The temperature of water entering a heater is 12 degrees C. The rate of flow of water through the heater is 3.6 x 10^2 cm^3min^-1 and the output temperature of the water is 20 degrees C. What is the power of the heater?(Density of water = 1000 kg m-3, specific heat capacity of water 4200 J kg-1K-1)

So change in temp is 8.
I tried working out the volume by converting 360 cm^3 into 360*10^-6 m. This is per minute so to find the volume per second I divided by 3600 and then to get the mass I multiplied it by the density to get 1*10^-4g. I then put this into the equation using c as 4200 to get 3.36???

The answer is 0.20kW and I have no idea where this comes from
0
2 years ago
#2
(Original post by MrToodles4)
The temperature of water entering a heater is 12 degrees C. The rate of flow of water through the heater is 3.6 x 10^2 cm^3min^-1 and the output temperature of the water is 20 degrees C. What is the power of the heater?(Density of water = 1000 kg m-3, specific heat capacity of water 4200 J kg-1K-1)

So change in temp is 8.
I tried working out the volume by converting 360 cm^3 into 360*10^-6 m. This is per minute so to find the volume per second I divided by 3600 and then to get the mass I multiplied it by the density to get 1*10^-4g. I then put this into the equation using c as 4200 to get 3.36???

The answer is 0.20kW and I have no idea where this comes from

You should divide by 60 instead of 3600. 1
2 years ago
#3
(Original post by MrToodles4)
The temperature of water entering a heater is 12 degrees C. The rate of flow of water through the heater is 3.6 x 10^2 cm^3min^-1 and the output temperature of the water is 20 degrees C. What is the power of the heater?(Density of water = 1000 kg m-3, specific heat capacity of water 4200 J kg-1K-1)

So change in temp is 8.
I tried working out the volume by converting 360 cm^3 into 360*10^-6 m. This is per minute so to find the volume per second I divided by 3600 and then to get the mass I multiplied it by the density to get 1*10^-4g. I then put this into the equation using c as 4200 to get 3.36???

The answer is 0.20kW and I have no idea where this comes from
You got the correct method just be careful when converting the time into seconds, you are going from minute to seconds
1
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