- #1

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thanks!

(this is my first post, i wasnt sure if it goes in the homework thread since it's not a specific problem)

- Thread starter jevillan
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- #1

- 8

- 0

thanks!

(this is my first post, i wasnt sure if it goes in the homework thread since it's not a specific problem)

- #2

Andrew Mason

Science Advisor

Homework Helper

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Welcome to PF.

thanks!

(this is my first post, i wasnt sure if it goes in the homework thread since it's not a specific problem)

You should keep your units in the same system. You cannot use cgs (centimetres, grams, seconds) units interchangeably with MKS units (metres, kilograms, seconds). You have to convert.

A Joule is a measure of energy in MKS units. A Joule is one Newton x 1 metre. Since a Newton is 1 kg x 1 m/sec^2, a Joule is also 1 kg x 1 (m/sec)^2.

So if you are trying to find [itex]\Delta Q = mC\Delta T[/itex] in Joules but you are given the heat capacity Joules/gram, and mass in kilograms, convert c to Joules/kg before plugging the value in.

AM

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