RAIKEY

no not a Terminal velocity issue..

its a gravity one

both bullets hit the floor at the same time,...

they are the same hieght above ground,..

the speed of the fired on is tottally irrelevant ,...gravity ingnores it,...

a marksmans point of veiw wud explain it easily

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TH&S

Have you taken into account the rotational speed and curvature of the earth...?

The bullet should, in theory hit the floor after the dropped bullet, as and given that the earth is 'spherical' it will have marginally further to fall as the earth has rotated under it since it was shot...

Thats my BS answer anyway....

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D: 220 | B: 140 | S: 210

Rosko

Don't get me wrong Raikey, i understand that questions need to be asked in order to get answers but honestly mate, a question that starts 'if a plane was on a massive treadmill....' is just ridiculous!!!

How about questions like 'if we done this could we slow down global warming?' or 'if we use this with this does is slow down cancer?'

I just find some of the things that students do nowadays pathetic, more of an excuse not to get in the real world than actually learn!!!

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tony 33

dont be daft the plane has to be phisicaly moving to create uplift...a planes wing is designed so that more air passes under than over the wing thus creating uplift..if it ait moving it aint going up..

TH&S

Yes.

Its not the acceleration on the runway which gives the plane its speed, its the amount of air you manage to get under the wings, the faster you go the more lift is generated, therefore the faster the conveyor belt goes in relation to the speed of the airplane (i.e. ensuring the speed is matched during acceleration) the more lift can be generated.

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D: 220 | B: 140 | S: 210

RAIKEY

lol no mate, i get yer,....you mean like a study by a university into how long it takes for baked beans to cool down , or how brown the toast should be,,..lmao,,

i know wot your on about now man,...lmao,....:love:

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TH&S

Do you have the answers to them?

I always end up burning my mouth on the beans and frozen bread... :(

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D: 220 | B: 140 | S: 210

attitude746

The plane wouldnt take off.
And the bullet one errrr are you saying basically that you hold a gun a metre from the ground and fire it at the ground?? And at same time drop a bullet aswell??
If so then the bullet fired would hit ground first, and if thats not what you mean i really dont give a fook!

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Frog

Worst bit is when the burning beans go in your mouth and the frozen bread freezes to your lips, so ya can't spit the burning beans out cos your mouth is stuck together, and then you scream, rip the skin off your lips and drop the beans down your nice white shirt.

Horrendous times

As for the Plane theory.

My opinion is no, as lift in an plane is caused by relative displacement of air over the wing and under the wing, Something along the lines of the air is displaced quicker over the wing thus the pressure is less so the wing rises into the area of low pressure. Thats what i remember from Physics anyway so could well be wrong.

As for the Bullet and the gun.

Well, Gravity only works down, So ina theoretical question where air resistence didnt exist it should be the same time. However if air resistance is there, they put rifling on the barrels to spin the bullets, to stop them Dropping and changing path etc. However in a Vacuum obviously this would have no effect you could also state that air resistance would have the same effect on a Bullet dropped, but i think it would be different, due to the bullet being more aerodynamic. ANd now i'm lost in the grey misty world of Physics that i don't really remember and i'm never gunna make a definitive answer and instead i'm gunna go to bed where the issue will bug me for a good five minutes until i fall asleep.

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tommy28

i'm finding it hard to grasp some of the answers given to the plane question.

imo the plane WOULD take off as the backward force provided by the treadmill does NOTHING to counteract the thrust of the jet engines.

simply put, jet engines provide thrust by sucking in air from the front, and blasting it out at a much faster rate from the rear.

if it were a car, it would remain stationary - the drive (from the wheels) being negated by the backward force of the treadmill

however the plane has free running wheels which do not provide any driving force, and the treadmill does nothing to alter the normal movement of air around the plane. as such, all that would differ between taking off from solid ground and taking off from the treadmill would be the speed at which the planes wheels were revolving at the point of takeoff itself. the velocity of the plane at this point would be identical in both cases.

RAIKEY

you know what,.....

put that way,,,hes spot on i reckon,.....

makes sense when you take away the beans on toast part of the equation,,,,

lol

reps

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volatileacid

If I'm sitting on the wing of this plane.... and the plane is on a treadmill, and the treadmill is going at 500mph.... if the plane is to stay on the treadmill, its engines would have to provide enough thrust to counteract the treadmill taking the planes backward.... so ultimately, they cancel themselves out - the plane remains stationary.. and me sitting on the wing will not feel any air blowing towards me - and if there is no air going above or below the wing - the plane is staying where it is.

Post this topic on any board, and it's the same debate every time.

bb the great

maybe you should go and study art then?

mate, your talking out your ****, when did i ever say we were asked this question in uni? it was posted on another board a while back. i said i study this stuff, i.e aerospace engineering.

an excuse not to enter the real world and learn? personally id rather have the time of my life at uni for 3 years whilst learning, then go travelling for a year then settle down. what is the rush?if i get accepted onto a graduate training scheme, starting salary is about 26k which just keeps going up and up.

i will agree that some degrees are stupid though.

RAIKEY

the treadmill wont take the planebackwards tho co its not the friction to the road thats in question,...

the thrust acts upon the air behind the jet,....


another way to see it is,..

if you put grease on the runway, the lessened friction would not make a sniff of difference to the jet, because it dosent need grip on the road to drive forwards,...

a car does,...

the car wud slippy slide all over ,...the plane would still move forwards and take off ,..its wheels mite not turn as it does,,..but it wud still take off....

,...

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bb the great

that is the way i thought about it!