x Turn on thread page Beta
 You are Here: Home >< Physics

# thermal physics question help?? watch

1. to drive the turbines in the power station superheated steam at 450k is required. cold water the boiler at 290k. suggest and explain two reasons why you can not use the formula E=MCtheta, to calculate the energy needed.

i think it could be beacuse the specific heat capacity changes and lots of energy would be lost as, the temperature it at 723 degrees.
2. Hmm, i guess because E=mc theta refers to the specific heat capacity, whereas you're interested in the specific heat of vaporisation of water?

Plus the mass will be constantly changing... ?
3. (Original post by josh_a_y)
Hmm, i guess because E=mc theta refers to the specific heat capacity, whereas you're interested in the specific heat of vaporisation of water?

Plus the mass will be constantly changing... ?
o yh mass changes i one and energy loss thanks i think this is it
4. (Original post by josh_a_y)
Hmm, i guess because E=mc theta refers to the specific heat capacity, whereas you're interested in the specific heat of vaporisation of water?

Plus the mass will be constantly changing... ?
not really specific heat of vaporisation as this is only the energy at the change of state.
5. You could use the equation with waters SHC (4190 I think) up to 100degrees, then add the vaporisation energy, then use it again but with steams SHC (don't know) up to the required temperature I think.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 27, 2010
Today on TSR

### University rankings 2019

Cambridge at number one

### I have imposter syndrome at Cambridge

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE