Answer this physics question. Actually dont answer it, just tell me wtf is going on.

[ManBearPig]

c^2 = 7v^2

how does v = 0.377c ???????

damn this class. thanks

 

[JohnCU]

37% speed of light?

 

[Gunslinger08]

c = sqrt(7)v
c = 2.64575v
v = 1c/(2.64575)
v = 0.377c

This is basic algebra.

 

[ManBearPig]

c = sqrt(7)v
c = 2.64575v
v = 1c/(2.64575)
v = 0.377c

This is basic algebra.

Thank you kindly sir.

Now im trying to figure out why for

c^2 = 7.466049383v^2

v != .366

Or why that answer doesnt work for me. great.

 

[Gunslinger08]

Thank you kindly sir.

Now im trying to figure out why for

c^2 = 7.466049383v^2

v != .366

Or why that answer doesnt work for me. great.

0.366 is the correct answer for that.

 

[Sumguy]

lol...I wish my physics questions were that easy. Also, yeah, that is the correct answer for the second question, so wtf?

 

[ManBearPig]

oh i figured out what i did. thanks a lot man.

anyone wanna take a stab at this one?

How fast must an average pion be moving to travel 17 m before it decays? The average lifetime, at rest, is 2.6×10^−8 s.

 

[Ika]

Were you like 8 when you joined this forum?

How fast must an average pion be moving to travel 17 m before it decays? The average lifetime, at rest, is 2.6×10^−8 s.

Velocity is distance over time. You have the distance - 17m - and you have the time - 2.6^10-8 s.

 

[Sumguy]

oh i figured out what i did. thanks a lot man.

anyone wanna take a stab at this one?

How fast must an average pion be moving to travel 17 m before it decays? The average lifetime, at rest, is 2.6×10^−8 s.

Wouldn't it be D/S

So 17 divided by the number given, provided a moving pion doesn't decay any faster or slower when it moves at that ridiculous speed (also assuming it doesn't go faster than the speed of light)

 

[ManBearPig]

Err, no it wasnt that easy. It was actually pretty effing long. The answer was .90889c.

thanks everyone!

 

[Matthiasa]

Err, no it wasnt that easy. It was actually pretty effing long. The answer was .90889c.

thanks everyone!

How would it be long? Isn't the only other thing it needs to take into account gamma from what the others said?
/might fail at physics...

 

[ManBearPig]

How would it be long? Isn't the only other thing it needs to take into account gamma from what the others said?
/might fail at physics...

Heres where i got help with the solution:

http://www.cramster.com/physics-answers-5-725382-cpi0.aspx

 

[Hacp]

Were you like 8 when you joined this forum?


Velocity is distance over time. You have the distance - 17m - and you have the time - 2.6^10-8 s.

At those speeds, I think you need to worry about special relativity.

 

[Matthiasa]

Considering you would be going faster then the speed of light without it, I would say so.

 

[Ika]

At those speeds, I think you need to worry about special relativity.

Oof, go figure. I guess that's what I get for not paying attention in my own physics class...

 

[Hacp]

Hmm, the answer I got was 2.7E8. Hopefully that's right.

Use the equation

dt=dti/sqrt(1-v^2/c^2)

where dti is the time of the pion at rest. Then use the equation d=vdt, solve for dt, plug that into the first equation, then solve for v. d=17.

 

[Hacp]

c^2 = 7v^2

how does v = 0.377c ???????

damn this class. thanks

Join date was 2000. Were you like 9 when you joined?

 

[SKORPI0]

Physics question, more like a basic math question.

 

[ManBearPig]

Join date was 2000. Were you like 9 when you joined?

Hmm, the answer I got was 2.7E8. Hopefully that's right.

Use the equation

dt=dti/sqrt(1-v^2/c^2)

where dti is the time of the pion at rest. Then use the equation d=vdt, solve for dt, plug that into the first equation, then solve for v. d=17.

you are wrong. i love how the two people that have given me shit here get the answer wrong. i agree that i do suck complete ass at math, physics, and chemistry too though.

 

[Hacp]

you are wrong. i love how the two people that have given me shit here get the answer wrong. i agree that i do suck complete ass at math, physics, and chemistry too though.

Huh? Looking at the link you provided, I am pretty much right. If you suck at those subjects you'll never pass the mcat btw.

 

[ManBearPig]

Huh? Looking at the link you provided, I am pretty much right. If you suck at those subjects you'll never pass the mcat btw.

ah, my b. i didnt see you multiplied it by c.

yeah i didnt do too great on the mcats, but not awful. im beginning to think that i dont really want to follow this path but we shall see.

 

[TecHNooB]

When it's basic algebra, all the ATOT wannabe smartasses come running.

 

[Matthiasa]

When it's basic algebra, all the ATOT wannabe smartasses come running.

You ran here too.. Trying to tell us something?

 

[GodlessAstronomer]

You're doing special relativity and can't do basic algebra? Wow.

 

[TecHNooB]

You ran here too.. Trying to tell us something?

Absolutely. If you know the answer to the problem and you feel its easy, just answer it and move on.