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- Berry
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Does Canon have any immediate plans to produce a wide angle lens with image stabilization?
Fat people on a trampoline?
I'm sure you meand fat people while you are on a trampoline... if the fat people were on a trampoline you would need a faster shutter speed anyway...
they would be moving very quickly to earth due to gravity.......
Fat people would actually move slower than slim people
Hmm, so the accelerative forces would be the same, mass for mass
Are you saying that the air-resistance would be greater due to the increased size and wrinkles?
Acceleration due to gravity is independent of mass and is only affected by resistance - and fat people have a larger surface area and as such more air resistance making them fall slower.
I thought air resistance was determined by mass and surface area (otherwise a ping-pong ball would have the same terminal velocity as a large ball bearing). As mass increases as the cube of the linear dimensions, and surface area increases as the square, then fat people should fall faster.
Acceleration due to gravity is independent of mass and is only affected by resistance - and fat people have a larger surface area and as such more air resistance making them fall slower.
but being larger they have a smaller SA to volume ratio which is a determining factor in the affect of fricitve forces on acceleration
though when it comes to fluids (ie air) shape becomes a significant factor.
I suppose a fat person would have a greater CSA as they are unlikely to be significantly taller than a thin person
No, ping pong balls fly differently due to surface tension and fluid dynamics not mass.
It would have the same terminal velocity of a ball of lead with the same shape, size and surface tension properties
Sorry - no.
From Wikipeadia -
If the balls are the same, shape, size and surface properties - then the only thing that will differ in that equation is the mass (which will be substantially greater for the lead ball). So the terminal velocity will be higher for the lead ball.
If you want to take bouyancy into account then the difference will be even greater.
At their first tutorial, I used to get my science students to do an experiment measuring the time it took balls of various types to fall from different heights. Even in a classroom it was possible to see from the results that a ping-pong ball was approaching terminal velocity.
Would a 10-22 with IS have a higher Vt than one without?