91 points

I was really hoping he was going to convert the amount of energy needed into calories, then from calories into peanuts butter sandwiches

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13 points

1 calorie is interchangeable for approximately 4.1868 joules. Therefore, assuming his math was correct (many say it was not), I’m coming up with 2,687,016,337 calories needed. According to google, sourcing from the USDA, your average peanut butter sandwich has 384 calories. Therefore you’d be expending approximately 6,997,438 peanut butter sandwiches worth of energy to punt the ungrateful little shit into the sun.

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5 points

384 cal or 384 kcal per sandwich?

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2 points

Same.

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72 points
*

If your leg has a mass of 2kg, 1.1×10^10 J of kinetic energy would require your leg to be moving at about 150 100 km/second not faster than the speed of light.

TLDR: Their math is shit.

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16 points

Pretty sure you’re generating twice as much energy as needed, the required speed is only about 106km/s

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2 points
Deleted by creator
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11 points

Besides, if you really needed those kinds of speed, you’d obviously have to calculate with relativistic formulas. Energy is asymptotical at the speed of light.

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1 point
*

100 km/sec is not relativistic and even if it were, at no point would that object need to or could exceed the speed of light. Its a fundamental limit that cant be broken.

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3 points

Setting aside the correctness in OP for the moment, what’s being said here is that you don’t actually need to break lightspeed. The foot would have to be moving asymptomaticly close to lightspeed, but not passing it. OP used an equasion that works classically, but we’re in territory where that model breaks down.

But if the math doesn’t work out that way, anyway, then whatever, classical equasions are fine.

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2 points

Yeah, I was refering to the OP’s calculated result in that it’s incorrect not only by incorrect math, but also incorrect physics.

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2 points

Yeah, their answer just intuitively seems very wrong. The ratio between the kid’s weight and your foot’s weight should be equal to the ratio between their final speed and your foot’s required speed. Ridiculous.

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47 points
*

Not to mention the fusion reaction triggered by an FTL foot connecting with said child’s backside would annihilate both parent and child immediately.

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13 points

There would be a crater where the parent and child were, and buildings would be leveled by the resulting shockwave.

https://what-if.xkcd.com/1/

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32 points

Okay the math is obviously wrong, and it’s not even answering the question.

The question was, how much force. If punting the kid involves a kick, let’s say the foot makes contact with the kid for about 25 cm. Then the force required over this distance is on average 45 GN.

This is equivalent to the child experiencing roughly 180,000,000 G

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29 points

Or just get another child. I know they don’t grow on trees but I’m sure they grow somewhere

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17 points

The fiery pits of hell

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13 points

That not a nice name for the uterus

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8 points

But still accurate. That fucker tries to kill me every few weeks for some reason.

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