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Old 01-23-2009, 05:27 AM   #1
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i really hate physics.

In the chapter, we saw that a personís reaction time is generally not quick enough to allow them to catch a dollar bill dropped between the fingers. A demonstration of reaction time is to hold one end of a dollar bill so that it hangs lengthwise below your fingers, then ask a friend to hold his fingers near the center of the bill. When you release the bill, he is to try to catch it.

If a typical reaction time in this case is 0.20 s, how long would a bill need to be for a person to have a good chance of catching it?


I cannot figure this problem out.

I've used 3 different formulas and come up with 19.6cm all 3 times.

But when i post that answer i get this response.

"Keep in mind that your friend's fingers are originally aligned with the center of the bill. If he is to just catch the bill in time, he would grab the bill at the top."

Help??
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Old 01-23-2009, 05:29 AM   #2
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**** that. i like doing labs, but i hate the math parts.
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Old 01-23-2009, 05:32 AM   #3
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the math parts are easy for me now that ive finally figured out the formulas....but im not getting what im doing wrong here...i thought i took everything into account but i guess i have to figure in somehow that the bill is only half? but i tried cutting 19.6 in half and that didn't work for an answer either.
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Old 01-23-2009, 05:32 AM   #4
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divide your answer in half
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Old 01-23-2009, 05:32 AM   #5
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Quote:
Originally Posted by redlineblueline View Post
divide your answer in half
read above lolz
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Old 01-23-2009, 05:32 AM   #6
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take into account weight?
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Old 01-23-2009, 05:34 AM   #7
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Dude I would help you but I never took physics. Have a friend that did. I don't know why I replied if i'm no help. Well, I am in a way....


BUMP! maybe someone who knows will see it! GL
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Old 01-23-2009, 05:34 AM   #8
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assuming its done in a vaccuum, everything falls at the same rate of gravity. you can't really take into account the resistance of air and what not in this level of physicws.
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Old 01-23-2009, 05:37 AM   #9
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this is not taking into account any disturbances....like ls1fbody its assuming its done in a vacuum.
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Old 01-23-2009, 05:37 AM   #10
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Ahhhh true that ^ smoke some mary jay everyone knows answers and gets all into thinking when they do

JK JK JK
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Old 01-23-2009, 05:45 AM   #11
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FUCKKK.

i was dumb.

i had to DOUBLE it....not cut it in half. jesus.

probably helps that ive been up for wayyy to long. and i have to be up in 4 hours now lmao
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Old 01-23-2009, 05:50 AM   #12
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Congrats!!!!!
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Old 01-23-2009, 05:52 AM   #13
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i knew it was something to do with the halfway thing
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Old 01-23-2009, 05:57 AM   #14
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Quote:
Originally Posted by redlineblueline View Post
i knew it was something to do with the halfway thing
uhhhh huh suuuure (thats what i said too)

jk!
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Old 01-23-2009, 10:52 PM   #15
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if there fingers are at the middle then there is half above (the part you figured out to catch) and half below that he can't possibly catch...If you just figured out how long it needed to be from where it was in his hand to where he could catch it, you'd have to double that because the same amount is below his fingers...

Hope that makes sense...
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Old 01-23-2009, 11:22 PM   #16
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Quote:
Originally Posted by Spectral View Post
In the chapter, we saw that a person’s reaction time is generally not quick enough to allow them to catch a dollar bill dropped between the fingers. A demonstration of reaction time is to hold one end of a dollar bill so that it hangs lengthwise below your fingers, then ask a friend to hold his fingers near the center of the bill. When you release the bill, he is to try to catch it.

If a typical reaction time in this case is 0.20 s, how long would a bill need to be for a person to have a good chance of catching it?


I cannot figure this problem out.

I've used 3 different formulas and come up with 19.6cm all 3 times.

But when i post that answer i get this response.

"Keep in mind that your friend's fingers are originally aligned with the center of the bill. If he is to just catch the bill in time, he would grab the bill at the top."

Help??
9.81m/s≤ is acceleration due to gravity. since you would have to catch the bill within .2s, velocity is 1/5 of that, so velocity is 1.96m/s, or 196cm/s
196m/s over 0.2s is 39.2cm. The bill will fall 39.2cm before you can react. However, since you start by holding the bill in the middle, 39.2cm is only half of the length of the bill, so the whole bill would be 78.4cm

I'm not positive on this one like i was your last assignment, but that's my best shot ATM. It shouldnt be correct though, because velocity would only be 1.96m/s if you assume acceleration is linear, and we all know it to be exponential.
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Old 01-23-2009, 11:22 PM
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