/sci/ - Science & Math

[Anonymous No.10007631]

PLEASE HELP /SCIENCE/ I JUST HAD MY FIRST MIDTERM AND THIS WAS THE ONLY PROBLEM ON THERE AND I FAILED. WHAT IS THE ANSWER PLEASE HELP


TAGS: PHYSICS, NEWTON,

[Anonymous No.10007638]

>>10007631
1 + 0.5 = 1.5

[Anonymous No.10007640]

>>10007631
1kg

[Anonymous No.10007649]

>>10007631
(0.5kg/fly)(5total flies) - 1 = 2.5 - 1 => 1.5kg
More simply, (.5kg x 5) - 1kg = 1.5kg

1-0.5kg = .5kg jar (flies+air)
It really depends on how you interpret "flies weigh 0.5kg", as in all of the flies weighed together (second equation)? or each of the flies weigh 0.5kg (first equation)?

[Anonymous No.10007659]

>>10007631
>Flies weighs 0.5kg

jesus christ what are these monsters?

[Anonymous No.10007663]

>>10007631
scales can't read, dumbass

[Anonymous No.10007667]

>>10007638
>>10007649
But how can scale weight those flies?

[Anonymous No.10007677]

>>10007659
thanks for the laugh, you made me realize how stupid the problem is. half kilogram flies... what amazonian jungle did these get pulled from?

[Anonymous No.10007684]

>>10007631
In order to stay airborne, the fly has to exert downward pressure equaling its weight.

[Anonymous No.10007705]

>>10007667
The flies have to push air down to fly. The scale measures the pushed down air.

[Anonymous No.10007711]

>>10007705
what about the pushed up air over the wings

how do you know the scale isnt going to weigh less than the jar if the flies are pushing the air

[Anonymous No.10007714]

if the flies are accelerating, the scale reading fluctuates

[Anonymous No.10007715]

>>10007705
Oh I understand now, I feel like a brainlet now

[Anonymous No.10007738]

>>10007715
yea you do
never return to this forum

[Anonymous No.10007739]

>>10007649
You can weigh them individually. It's assumed he did that before, because we know the (combined) weight of the flies. You could also net the jar, put the flies in, then
|Jar - (Jar + Flies)| = weight of the flies

If you wanted to be more precise, what
>>10007705 said if you also want to measure the force of the flies pressing down on the air that's pressing down on the jar that's pressing down on the scale.

Also, >>10007714
Assuming a is not constant.

This equation depends on a number of factors that aren't defined in the system. Just from math alone, my first post. But what these anons said are true as well, depending on the proposed complexity of the question, which will vary the result a little bit depending on how many factors we're counting and what your teacher had intended for you to assume.

[Anonymous No.10007741]

>>10007739 was meant for >>10007667
>me

[Anonymous No.10007747]

The question is wrong because you can't measure weight in kilograms.

[Anonymous No.10007753]

>>10007747
>the question is wrong
>question
>wrong
>you are wrong for asking something
>what you ASKED is wrong

[Anonymous No.10007755]

>>10007753
Why are you gay?

[Anonymous No.10007786]

Can flies generate 0.5kg downforce thrust?

[Anonymous No.10007800]

>>10007786
can a few flies weigh over a pound?

[Anonymous No.10007956]

>>10007714
There's no actual fluctuation, differential pressures in the container will cancel each other out

[Anonymous No.10007968]

>>10007956
that's like saying jumping on a scale doesn't affect its reading

[Anonymous No.10007978]

>>10007968
false analogy, the flying object doesn't directly imposes a force on the scale or container, but on the compressible gas within the container

[Anonymous No.10007980]

>>10007978
Shut up, retard

[Anonymous No.10007981]

>>10007980
git gud mathematician

[Anonymous No.10007997]

>>10007968
>>10007978
Is not a good analogy because you are comparing 1 person to 100s of flies. There would be a statistical average equal to the weight of the flies. If some are accelerating upward, others are accelerating downward.

[Anonymous No.10008260]

>>10007755
retard

[Anonymous No.10008263]

>>10008260
Why are you such a nigger?