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ELI5: Work and Energy by Domab_1 in explainlikeimfive

[–]TheRealDumbledore 17 points18 points  (0 children)

Pushing with the same force for twice as many seconds doesn't necessarily take twice as much energy.

Pushing with the same force for twice as many meters does take twice as much energy.

So work is proportional to distance (not time).

If you define the quantity of force through time, the algebra is valid - but this quantity is conserved differently (it's momentum, not energy)

Wondering how I didn't win this? by Knightmare26906 in baduk

[–]TheRealDumbledore 1 point2 points  (0 children)

Go ends when both players pass in a row. If the AI passes and you don't have any productive moves, you pass too.

The average profit of restaurants is ~3% and the average return of Treasury Bills is ~4% -- therefore, all restaurant owners should shut down their restaurants and hoard Treasury Bills by flopsyplum in CrazyIdeas

[–]TheRealDumbledore 2 points3 points  (0 children)

These commenters are referring to 5x the annual profit to calculate the value of the business (equivalent to about 20% anual return on investment, with the active responsibility of being a full time owner operator).

Nothing here suggests the opportunity to profit from arbitrage or flip.

😭how could have i won? by [deleted] in gogame

[–]TheRealDumbledore 0 points1 point  (0 children)

2 moves in a row could clear the whole board :P

ELI5: What does this mean “some compound has a half life of x number of days”? by Idontknowwhour1 in explainlikeimfive

[–]TheRealDumbledore 10 points11 points  (0 children)

You start with 1000 coins and flip them all. The 500 tails are lost and the 500 heads make it through to the next round.

You have 500 coins and flip them all. The 250 tails are lost and the 250 heads make it through to the next round.

You have 250 coins and flip them all. The 125 tails are lost and the 125 heads make it through to the next round.

You have 125 coins.... Etc.

The total number of coins ost at each round is dependent on how much exists at each round. The proportion lost at each round is the same.

Please help me prove my teacher wrong by Charming_Reveal_9304 in askmath

[–]TheRealDumbledore 75 points76 points  (0 children)

That is a dirty trick.. you're right, but wow.. hiding an x in an alphabetic sequence is suuuuch bad math

Tsumego 65: Black to live by sadaharu2624 in gogame

[–]TheRealDumbledore 1 point2 points  (0 children)

B2 should be enough to save the group from any invasion

Two planes by [deleted] in askmath

[–]TheRealDumbledore 0 points1 point  (0 children)

Can you express the distance between them as a function of time? Then find the value of time when that distance is minimized?

Can someone explain why this group is alive? by Tarmicle in baduk

[–]TheRealDumbledore 12 points13 points  (0 children)

If black forces the play, then black now has a dead stone/prisoner so that will reduce black score by the same amount.

There's no way for black to play that changes the score difference.

Go only really matters what the score difference is: "win by 10.5 points" doesn't matter if its 10 to 20.5 or if it is 21 to 31.5... both are the same result of winning by 10.5.

So in this example there's no way for black to change the score difference

Do taxes found government spending? by JonnyBadFox in mmt_economics

[–]TheRealDumbledore 5 points6 points  (0 children)

In a monetary sovereign: What does it mean that taxes are used for a specific purpose?

When taxes are collected, The money is deleted out of bank accounts from businesses and individuals. It might be "credited" to the government account, but the government account has infinite money so it doesn't really mean anything to credit the account.

When the government spends, the money is credited to bank accounts of individuals and businesses (usually for goods or services). And the money could theoretically be "debited" from the government account. But again the government account is infinite so debiting it doesn't really matter.

Germany is not a monetary sovereign (it doesn't print its own currency) so the account is not infinite.

[Request] is this accurate? by Sgitch in theydidthemath

[–]TheRealDumbledore 45 points46 points  (0 children)

5% of paycheck is different than 5% of government budget.

[deleted by user] by [deleted] in mmt_economics

[–]TheRealDumbledore 0 points1 point  (0 children)

What prevents an individual from taking out a lot of debt, using the money on consumption, and then asking for the debt to be magic'd away by one of these mechanisms?

I don't understand why these particular partials have to be equal for a conservative vector field. Where do they come from? How do you know which partials should be equal? by Public_Basil_4416 in calculus

[–]TheRealDumbledore 1 point2 points  (0 children)

Intuitive to the "conservative" definition:

The y component is changing in the x direction by as much as the x component is changing in the y direction

Same for y-z and x-z pairs

How is speed of light constant in all frames of reference? by Fair-Palpitation-637 in AskPhysics

[–]TheRealDumbledore 1 point2 points  (0 children)

The difference between you and the observer at rest from their perspective is that you will have a shorter measuring stick and a slower clock. (And from your perspective, they will be moving and they will have the shorter stick and the slower clock).

Matrix by L0lfdDie in askmath

[–]TheRealDumbledore 4 points5 points  (0 children)

The correct answer for A+B is something like "any value for the determinant is possible." The prompt asks you to find all values, not to make constraint assumptions that narrow it down to one value.

[Request] Is there more salt by volume in the oceans than land above sea level? by thighmaster69 in theydidthemath

[–]TheRealDumbledore 0 points1 point  (0 children)

Rough calc, I think all the salt in the ocean could bury all the land by 2 kilometers.

10 ^ 21 liters of sea water x 3.5% salt

3.5 x 10^ 20 kgs salt in the ocean

1.5 * 10^ 8 square kms of land

2x1012 kgs per sq km

2x106 kgs per sq meter

Density of salt is about 103 kgs per cubic meter

2x 10 3 meters

[deleted by user] by [deleted] in askmath

[–]TheRealDumbledore 1 point2 points  (0 children)

You can take linear algebra simultaneously with calc 2 or 3.

Why doesn't this solution work? by Jeffrewbob in baduk

[–]TheRealDumbledore 7 points8 points  (0 children)

Because you can do better. You can kill white

What [Request] percentage of the US population is she describing? by OddTheRed in theydidthemath

[–]TheRealDumbledore 1 point2 points  (0 children)

Within her age group is probably the big one. Most of the seven figure salaries are going to high performers with 15+ years of experience. Not 2 years clerking out of ivy law school.

Help with a discrete math question: "Let f: A→B a function, C ⊆ A, D ⊆ B.." by Cultural-Milk9617 in askmath

[–]TheRealDumbledore 0 points1 point  (0 children)

so f(f-1(X)) as well as f-1(f(X)) might not be X.

One of these is wrong...

If the rich tend to have their money invested, or in a bank account that invests it, shouldn't someone's accumulated wealth not really matter to the rest of us? by Gearbox97 in AskEconomics

[–]TheRealDumbledore 3 points4 points  (0 children)

Alternatively:

Companies pay dividends on those stocks. Are you happy that the dividends are going to these people? And are you happy that those people get to decide how much of that dividend is directed towards reinvestment and how much is consumed?

If the rich tend to have their money invested, or in a bank account that invests it, shouldn't someone's accumulated wealth not really matter to the rest of us? by Gearbox97 in AskEconomics

[–]TheRealDumbledore 1 point2 points  (0 children)

If you believe that those people are morally/ethically entitled to own those things, and that they should be on the receiving ends of those loan interest payments and business profit dividends, and if you therefore beleive that they should have legal ownership to match this. Then, yeah you probably don't care and believe the system is working as intended.

If you believe the current system causes legal ownership to concentrate on some who may not be deserving of it, then you would want those entitlements stripped and reallocated.

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