Thursday

November 27, 2014

November 27, 2014

Posted by **Sam** on Thursday, September 8, 2011 at 1:16pm.

Express your answer using two significant figures.

I know the answer is 2100 cal, but I just need to know why the answer is a positive value instead of negative, when it is supposed to be cooling down.

- Chemistry -
**DrBob222**, Thursday, September 8, 2011 at 2:02pmCooling water means the heat is given off and heat emitted is negative, always. Look at it the other way. If heat were absorbed, it would be positive and the temperature of the water would increase. Right?

- Chemistry -
**Sam**, Thursday, September 8, 2011 at 3:57pmI have another question about this problem. I know that dT is (T(final)-T(initial)).

is the T(final)=23C or is it 48C?

since it's from "48C to 23C", shouldn't the final be 23C? and the initial 48C?

**Answer this Question**

**Related Questions**

Physics - Problem 21.40 A pair of 10uF capacitors in a high-power laser are ...

physics - Find its density. Express your answer to two significant figures and ...

Physics - Item 4 Two 2.0 masses are 1.0 apart on a frictionless table. Each has ...

physics - Item 4 Two 2.0 masses are 1.0 apart on a frictionless table. Each has...

Chemistry - Suppose you use 135 calories of energy to perform a task, how many ...

Math - Find the largest angle for which sine and tangent agree to within two ...

Physics - Problem 21.79 The plates of a 3.2nF parallel-plate capacitor are each ...

Physics - Problem 21.79 The plates of a 3.2 nF parallel-plate capacitor are ...

physics - C Exercise 3.57 In laboratory situations, a projectile’s range can be ...

Physics - Problem 22.16 A 7.5 v battery supplies a 3.5 mA current to a circuit ...