February 27, 2017

Homework Help: Physics

Posted by Adam on Monday, December 3, 2007 at 12:32pm.

Could someone please help me with these questions. . .
1. Why are there positive and negative electrical charges, while magnetic poles always seem to be bound together?

2.If two resistors are connected in parallel, how do you know that their effective resistance will always be less than the resistance of the smallest resistor actually in place?

3.Explain how voltage current and resistance could interact to give a person a severe electrical shock if he or she touched an electrical wire in the wrong way.

4.A cannonball shot from a cannon with a long barrel will have a greater muzzle velocity. Explain why this is so. Use your knowledge of momentum, impulse and energy in your explanation.


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