Since each quart of oil cost $1.25 ($5/4) and you need 30 quarts of oil (6*5) then you would need $37.50 ($1.25*30) to start.
Oil is a lubricant, it allows the interacting surfaces of the machine to slip past one another with the minimum amount of friction, therefore reducing heat buildup.
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A machine decreases the amount of force needed to work, as it distributes the force throughout a larger distance.
Gold Medal machines provides popcorn machines, and can be purchased for a reasonable amount of money. The machines can be found at http://www.gmpopcorn.com/.
Because the action requires the same amount of force.
A machine exerts a great amount of energy. This is because machines are meant to do things that are often difficult or time consuming quickly and efficiently.
No machine is 100% efficient. The amount of work you get out of the machine is always something less than the amount of work you put into it. So you have to put in more work than the job actually requires. It's the price you pay for making the job 'easier' by using the machine to do it.
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The smaller amount of friction a machine has, the more efficient it becomes.
Whatever the minimum payment amount is according to the policy. If you're not certain of what it is, contact the issuing agency.
The amount of fluid removed is decreased
Simply put, a simple machine makes the work much easier. Simple machines reduce the amount of force needed to do the work. A pulley, for instance, is a great example of a simple machine.