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Help my dumbass (Physics) +K for answer

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ztragnoB
Posts: 1704 - Karma: 27
I can't figure this shit out for the life of me. If anyone can help it would be much appreciated.

A mass M is attached to a spring which has a spring constant, k. The mass is set into motion and the period is measured to be 1.5 seconds. Next a 1 kg mass is added to M. When this altered system is set into motion the period is measured to be 2.5 seconds. Find the calues of the mass, M, and the spring constant, k. (Answers have to have 4 significant digits too)

Word and thank you NS.
Feb 16 2010 10:30PM
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RudyGarmisch
Posts: 25443 - Karma: 13,844
1.21000 +/- Jigiwats.
Feb 16 2010 10:31PM
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Hansel.
Posts: 4583 - Karma: 112
you might need a flux capacitor for that one
Feb 16 2010 10:32PM
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ztragnoB
Posts: 1704 - Karma: 27
I need to show my work to get full credit, probably should have mentioned that.
Feb 16 2010 10:37PM
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lahnabonny
Posts: 1260 - Karma: 35
wOoOaAaHh 1985
Feb 16 2010 10:38PM
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bstuck1
Posts: 426 - Karma: 46
Frequency = 2pi * Square Root of (K/M)
Feb 16 2010 10:45PM
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ztragnoB
Posts: 1704 - Karma: 27
Frequency= 1/all that shit you posted. But thats not the problem. I need the origional Mass before the kg got added to it, and the spring constant, K.
Feb 16 2010 10:47PM
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twintip_payne
Posts: 499 - Karma: 13
1/2 k x squared son
Feb 16 2010 10:47PM
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bstuck1
Posts: 426 - Karma: 46
Sorry meant to say period. You can plug in how period is changed by adding the mass and go from there.
Feb 16 2010 10:51PM
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twintip_payne
Posts: 499 - Karma: 13
period frequency = inverses
Feb 16 2010 10:54PM
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Bepo
Posts: 8195 - Karma: 17
set up two equations with 2 unknowns, k and m. For the first one use m and k, for the second use (m+1) and k (since the k is the same). solve
Feb 16 2010 10:54PM
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ztragnoB
Posts: 1704 - Karma: 27
Maybe you didn't see the part about me being a dumbass haha.

I have 5.55=m/k
and 15.4=m+1/k

And now I'm stuck again.
Feb 16 2010 11:00PM
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b_dubly
Posts: 52 - Karma: 10
[URL=http://img163.imageshack.us/i/img0542n.jpg/]Click for larger image[/URL]

[URL=http://img269.imageshack.us/i/img0543rm.jpg/]Click for larger image[/URL]


or if that doesnt work which i can see happening..

http://img693.imageshack.us/img693/1378/img0542q.jpg
http://img641.imageshack.us/img641/8031/img0543b.jpg

i like physics
Feb 16 2010 11:07PM
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Click_Here
Posts: 1728 - Karma: 14
goddamit boy. thats some good will hunting shit right there
Feb 16 2010 11:14PM
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ztragnoB
Posts: 1704 - Karma: 27
Yo Nu Wu, i tried to plug shit in to your equations but it came out as k=.1008. I feel like it needs to be a lot bigger then that. I know it's a lot to ask but could you solve for M and K to double check what i got?
Feb 16 2010 11:27PM
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b_dubly
Posts: 52 - Karma: 10
just plugged that shit in n got
k = 9.8697
m = .5625
Feb 16 2010 11:36PM
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ztragnoB
Posts: 1704 - Karma: 27
I wish i knew how you did that. But those answers work. Thanks man, and if you're in the mood dont be afraid to post any extra work you have, shit helps a lot. Thanks again though homie.
Feb 16 2010 11:47PM
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chapz
Posts: 10182 - Karma: 66
what physics are you in? he used T =2pi(m/k)^(1/2)

if you dont have that formula? T is the period, (1/f if i remember correctly), m is the mass is kg and k is the spring constant in N/m. then, you have to set up two equations, and make them equal to eachother and solve!
Feb 17 2010 12:29AM
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ztragnoB
Posts: 1704 - Karma: 27
THANKS BITCH
Feb 17 2010 12:44AM
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