The citric acid inside in a fruit could make it work. Fruits that is part of the citrus family has a contains a citric acid. For example a lemon, it could make a light bulb work. :)
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You have to pay for the work (enegy) of 150 watt hours. Scroll down to related links and look at "watt-hour - Wikipedia".
The more persons the easier the job is for example Oneperson can build a house but it will take some time. Tenpeople can build a house much quicker and easier. Ever tried doing a job where you wish you had some help. Do you think the job would be easier with another person? Many hands make light work
A device to make work easier is a machine, such as a lever.
Whether or not if it's an equation because it has no equality sign. but that is wrong it is trying to work out the speed of light.
If you work every day that week you will make $1,680.