The Carbon Footprint of Moving Bottled Water

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John-Paul Flintoff of the Times drove to Oxford and back, a total of a hundred miles, and noticed that he had a bottle of water on the seat. He wondered how much energy it took to move it.

I converted the weight of the bottle (1 kilo) into pounds, and divided the distance (100 miles) into feet, using one of many online conversion sites. Then I converted the total number of foot-pounds into kilowatt hours. The result: 0.437 477 242 4.

In other words, if I had left the bottle at home I could more usefully have used the same amount of energy to light my house all evening.

But I am not certain about his math or physics; a foot-pound is the "the amount of energy expended when a force of one pound acts through a distance of one foot along the direction of the force." and he has calculated the distance and the force, but surely it takes more energy to move the water in a Land Rover than in his Golf, even though it is the same amount of water. Any physicists out there with the answer? TimesOnline

The Carbon Footprint of Moving Bottled Water
John-Paul Flintoff of the Times drove to Oxford and back, a total of a hundred miles, and noticed that he had a bottle of water on the seat. He wondered how much energy it took to move it.

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