Physics HALP

[applejuice.]

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

 

[ROOS.]

4

 

[Z-Juice]

 

[monkatizer]

u need english HALP! but seriously why would u ask NS for homework help, who the hell does there hw thats on NS?

 

[Funkadelic]

Have you tried cramster.com? That site is solely responsible for my physics 1&2 grades.

 

[applejuice.]

i do my homework. i've helped nsers do their homework.

 

[skithesprings]

1: read thishttp://www.vphausa.org/vphavn/chuyenkhoa/Relativity.pdf2: complete homework3: ????????4: acquire Curren$y

 

[Big_Meech]

http://www.wolframalpha.com/ you're welcome / best website ever

 

[An10a_Eng]

just facebooked you...chat me up and i can help

 

[applejuice.]

oh adam. you are the greatest

 

[.AR6rider.]

Shit, I used to be really good at this stuff, but I haven't taken physics in like 2 and a half years. Sorry...

 

[a_pla5tic_bag]

well he as his name suggests, he must be an astronaut and knows these things.

 

[noname..]

wolfram is pretty much the shit.

 

[blackoutbill]

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

 

[ndye]

for some reason, my high school physics has left me useless in this situation.

 

[pigglywiggly]

i despise physics. sorry i cant help aimee, i suck at it haha

 

[An10a_Eng]

high school physics is generally newtonian mechanics, not relativistic.