A machine gun, of mass 35. kg, fires 50. gram bullets, with a ...

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A machine gun, of mass 35. kg, fires 50. gram bullets, with a muzzle velocity of 750. m/s, at the rate of 300. rounds per minute. What is the average force exerted on the machine gun mount?
 
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Question 2

Describe how a simple electric cell works.
 
  What will be an ideal response?

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Answer to Question 1

188. N

Answer to Question 2

The simplest cells contain two plates or rods made of dissimilar metals called electrodes. The electrodes are immersed in a solution, such as dilute acid, called the electrolyte. The part of each electrode outside of the solution is called the terminal, and connections to wires and circuits are made here. The acid tends to dissolve one of the electrodes, leaving it with a negative charge. As the electrolyte becomes positively charged, electrons are pulled off the other electrode by the electrolyte. Thus this electrode becomes positively charged. Because there is an opposite charge on the two electrodes, there is a potential difference between the two terminals.

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