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Physics HALP

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applejuice.
Posts: 5506 - Karma: 1,512
1. An observer in stationary frame O observes an event in a moving frame O' at 0.9c, where c is the speed of light.


a) An event lasts 1 s in O'. How long is it perceived to take in O?



b) An object is 1 m long in O'. How long is it perceived in O?



2. Two rockets are approaching each other at 0.9c according to an observer in a stationary frame. According to an observer in Rocket 1, how fast is Rocket 2 approaching?



3. The molar mass of He is 2g/mole. What is the rest energy of a He atom?



Any help is appreciated, physics is not my forte. Thank you :) :)




Mar 14 2011 10:01PM
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ROOS.
Posts: 1992 - Karma: 39
4
Mar 14 2011 10:01PM
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Z-Juice
Posts: 3151 - Karma: 1,504
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Mar 14 2011 10:01PM
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monkatizer
Posts: 4704 - Karma: 1,518
u need english HALP! but seriously why would u ask NS for homework help, who the hell does there hw thats on NS?
Mar 14 2011 10:04PM
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Funkadelic
Posts: 1967 - Karma: 391
Have you tried cramster.com? That site is solely responsible for my physics 1&2 grades.
Mar 14 2011 10:05PM
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applejuice.
Posts: 5506 - Karma: 1,512
i do my homework. i've helped nsers do their homework.
Mar 14 2011 10:05PM
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skithesprings
Posts: 9086 - Karma: 1,349
1: read this http://www.vphausa.org/vphavn/chuyenkhoa/Relativity.pdf
2: complete homework
3: ????????
4: acquire Curren$y


Mar 14 2011 10:09PM
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Big_Meech
Posts: 152 - Karma: 33
http://www.wolframalpha.com/ you're welcome / best website ever
Mar 14 2011 10:10PM
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An10a_Eng
Posts: 2505 - Karma: 26
just facebooked you...chat me up and i can help
Mar 14 2011 10:10PM
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applejuice.
Posts: 5506 - Karma: 1,512
oh adam. you are the greatest :)
Mar 14 2011 10:13PM
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.AR6rider.
Posts: 15976 - Karma: 8,799
Shit, I used to be really good at this stuff, but I haven't taken physics in like 2 and a half years. Sorry...
Mar 14 2011 10:14PM
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a_pla5tic_bag
Posts: 9215 - Karma: 5,398
well he as his name suggests, he must be an astronaut and knows these things.
Mar 14 2011 10:15PM
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noname..
Posts: 449 - Karma: 91

wolfram is pretty much the shit.

Mar 14 2011 10:16PM
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blackoutbill
Posts: 2918 - Karma: 282
I'll give it a shot

a) .9(3.00x10^8)m/s*1s=2.7x10^8 meters

b) .9(3.00x10^8)/1=2.7x10^8 sec

c) Wouldn't it be twice as much? I'm not really sure lol

d) I think you use e=mc^2

Sorry, not much help and I might be totally off base
Mar 14 2011 10:17PM
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ndye
Posts: 3756 - Karma: 7,094
for some reason, my high school physics has left me useless in this situation.
Mar 14 2011 10:20PM
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pigglywiggly
Posts: 4482 - Karma: 305
i despise physics. sorry i cant help aimee, i suck at it haha
Mar 14 2011 10:24PM
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An10a_Eng
Posts: 2505 - Karma: 26
high school physics is generally newtonian mechanics, not relativistic.
Mar 14 2011 10:32PM
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