I am having trouble figuring out how to get rid of V in the the problem after line 6. Not sure how the expert got rid of them.
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A 10 ohm electric heater operates on a 110V line. Compute therateat which it develops thermal energy in W and in cal/s.
I am having trouble with distinguishing between when I need to use magnitude and when not to. This applies to more than just question 27, but I am using it as an example. In the first step why do you use the magnitude of the electron in proton (thus getting rid of the minus sign) where in other problems that are pretty similar, the minus sign is still there. Or do you always use the magnitude and the minus sign I am seeing is coming from somewhere else? Thanks.
I am having trouble determining what forces i should and should not include in my conservation of energy equations. As soon as I think I understand, I get stuck again. Is there a trick to making sure the equations account for each type of energy?