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OmegaGuy
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Science question

Post by OmegaGuy »

How many joules does it take to lift 1 ton of weight? Just wondering how I would figure that out.
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Einhander Sn0m4n
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Post by Einhander Sn0m4n »

To what distance?
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Kuroneko
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Post by Kuroneko »

For lifting close to the Earth's surface, U = mgh, where m is mass and g is gravitational acceleration (varies on location, but standard Earth gravity is 9.80665m/s²). In general, find the difference in the potential U = -GMm/r, where M is Earth's mass and r is the distance to its center.
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NoXion
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Post by NoXion »

And how strong is the gravity?
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OmegaGuy
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Post by OmegaGuy »

Kuroneko wrote:For lifting close to the Earth's surface, U = mgh, where m is mass and g is gravitational acceleration (varies on location, but standard Earth gravity is 9.80665m/s²). In general, find the difference in the potential U = -GMm/r, where M is Earth's mass and r is the distance to its center.
Thank you!
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sketerpot
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Post by sketerpot »

NoXion wrote:And how strong is the gravity?
Since the question involved weight (a force) rather than mass, the strength of gravity shouldn't matter. Unless, of course, OmegaGuy was being sloppy with the terms.
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NoXion
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Post by NoXion »

I thought weight was dependant on gravity?
Does it follow that I reject all authority? Perish the thought. In the matter of boots, I defer to the authority of the boot-maker - Mikhail Bakunin
Capital is reckless of the health or length of life of the laborer, unless under compulsion from society - Karl Marx
Pollution is nothing but the resources we are not harvesting. We allow them to disperse because we've been ignorant of their value - R. Buckminster Fuller
The important thing is not to be human but to be humane - Eliezer S. Yudkowsky


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NoXion
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Post by NoXion »

To clear up a little, I thought that on Jupiter I would weigh more, but my mass would remain unchanged.
Does it follow that I reject all authority? Perish the thought. In the matter of boots, I defer to the authority of the boot-maker - Mikhail Bakunin
Capital is reckless of the health or length of life of the laborer, unless under compulsion from society - Karl Marx
Pollution is nothing but the resources we are not harvesting. We allow them to disperse because we've been ignorant of their value - R. Buckminster Fuller
The important thing is not to be human but to be humane - Eliezer S. Yudkowsky


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Post by Exonerate »

NoXion wrote:To clear up a little, I thought that on Jupiter I would weigh more, but my mass would remain unchanged.
Correct. Mass is constant - weight is the force exerted on the ground (F = MA, so it is dependent on A, which is provided by gravity, which in turn is dependent on your distance to the object that is pulling you and its mass)

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OmegaGuy
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Post by OmegaGuy »

Well I meant gravity on Earth, but Kuroneko answered my question.
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