Posted by **SMK** on Friday, February 10, 2012 at 8:51am.

A 210W heater is placed in 2KG of water. What temperature rise is produced if the heater is switched on for 200 seconds?

- Physics -
**drwls**, Friday, February 10, 2012 at 9:05am
delta T = (heat energy added)/(M*C)

= (210 J/s*200s)/(M*C)

= 4.2*10^4 J/(M*C)

= 10,050 calories/(2 kg*1000 cal/kgC)

= 5.0 degrees

I converted to calories so I could use the easily remembered specific heat of water (C) in calorie/kg*C .

- Physics -
**SMK**, Friday, February 10, 2012 at 9:31am
So without converting to calories the answer would be 21 degree C, right?

## Answer This Question

## Related Questions

- AP Physics - You go to kitchen to boil water. You pour 280 gram of water to a ...
- College Physics - On average, an electric water heater operates for 3.4h each ...
- chem Help please! - A water heater is fueled by the combustion of propane as ...
- physics - . A water heater can has a power of 350 W. It is placed in a container...
- physics - An electric heater used to boil small amounts of water consists of a ...
- Physics! - If a water heater has a capacity of 54.4 gallons and a 4910 W heating...
- Physics Q - If a water heater has a capacity of 54.4 gallons and a 4910 W ...
- Math - A hot water heater measures 20" in diameter. What is the area of a metal ...
- math - A hot water heater measures 20" in diameter. What is the area of a metal...
- electron theory and ohm law - if the 5-ohm heater in problem 15 is placed with a...

More Related Questions