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Can anyone help me with this problem?

Homework Statement If a pressure of gas is suddenly reduced and we let the gas to expand again until it reaches equilibrium. What is final volume, work done and heat in this process? and what would be change in internal energy? Again the pressure is suddenly increased back to initial...

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It says undefined reference to draw_vector.

Homework Statement What's wrong with code below? I tried all day and night...don't know what's wrong and how to change the code. Help anyone. I have uploaded picture of map which I have to make http://www.portmain.com/intro/hw/hw05-field.html Homework Equations The Attempt at a Solution...