Ch 23-1 Quiz

Go down

Ch 23-1 Quiz Empty Ch 23-1 Quiz

Post  User X on Tue Mar 24, 2009 3:48 pm

1. In "Relativity Country" the conductor in a train traveling with 13.13 x107 km/hr aims the beam of a flashlight in the direction of the train motion. What is the speed of the light beam relative to ground in m/s (sheet 3)? Indicate with a positive (negative) sign whether the result would be different (the same) if the flashlight would be pointed in the opposite direction.
= 3E8 (negative)

User X
Guest


Back to top Go down

Ch 23-1 Quiz Empty # 2

Post  User X on Tue Mar 24, 2009 3:48 pm

2. A particle travels with 16.92 % of the speed of light past you. It has a clock attached to it which is identical to the clock you carry. You choose to ignore Special Relativity and claim the 2 clocks will show the same time. What is the magnitude of the percentage error you make (sheet 5 top,6. Give the magnitude of the difference of the relativistic factor from 1.00, multiplied by 100 ) ? Indicate with a positive (negative) sign whether the percentage error decreases (increases) with increasing speed of the particle.
=still working on # 2

User X
Guest


Back to top Go down

Ch 23-1 Quiz Empty # 3

Post  User X on Tue Mar 24, 2009 3:49 pm

3. A radioactive particle has a lifetime of 1.3 x10-8 s before it decays (dies) after its creation when observed at rest. The particle has a velocity of 2.674 x108 m/s relative to you standing in the laboratory. What is the lifetime of the particle as measured by you (sheet 6,Cool ? Indicate with a positive (negative) sign whether the liftime measured by you when "riding on the particle" is smaller (larger) than your result.
= 1.3E-8/(sqrt(1-(2.674E8/3E8)^2)) (answer is positive)

User X
Guest


Back to top Go down

Ch 23-1 Quiz Empty # 4

Post  User X on Tue Mar 24, 2009 3:49 pm

4. The lifetime of a hypothetical radioactive particle passing you with a speed of 0.9974 c, where c is the speed of light, is determined by you to be 4.933 x10-5 seconds. What is the "proper" lifetime of the particle (the time measured when it is at rest with respect to the observer) (sheet 6,9) ? Indicate with a positive (negative) sign whether the "proper lifetime" is (not) the one you measure when "riding on the particle".
=4.933E-5 * (sqrt(1-(.9974)^2) (answer is positive)

User X
Guest


Back to top Go down

Ch 23-1 Quiz Empty # 2

Post  User X on Tue Mar 24, 2009 3:50 pm

if anyone can help with # 2....
i cant seem to figure out what i'm doing wrong on that one

User X
Guest


Back to top Go down

Ch 23-1 Quiz Empty Question #2

Post  helping on Tue Mar 24, 2009 9:24 pm

100*(1-(sqrt(1-((value provided/100)^2))))

Answer is negative.

Thank you, User X, for the remainder of the problems.

helping
Guest


Back to top Go down

Ch 23-1 Quiz Empty #3

Post  blah on Tue Mar 24, 2009 11:49 pm

I keep getting a non-real answer for #3! how do u do it to get a real answer????

blah
Guest


Back to top Go down

Ch 23-1 Quiz Empty Question 3

Post  guest222 on Wed Mar 25, 2009 8:49 am

You're getting a non-real answer because you're not using parentheses correctly.
(1.3E-Cool/(sqrt(1-[(...E8)/(3E8)]^2)))

Now regardless of doing this, I'm still getting a wrong answer. Though, you do get a "real" answer

Can someone please comment on this....
thanks

guest222
Guest


Back to top Go down

Ch 23-1 Quiz Empty #3

Post  phyfrk on Wed Mar 25, 2009 11:59 pm

Hey....i'm not sure exactly what your doing wrong but the answer above that User X posted does work...

phyfrk
Guest


Back to top Go down

Ch 23-1 Quiz Empty #3

Post  phyfrk on Thu Mar 26, 2009 12:04 am

i think you might need to just check your parenthesis
other than that i think your work itself might be fine
and try to double check your numbers, maybe you entered something wrong on your calc?

phyfrk
Guest


Back to top Go down

Ch 23-1 Quiz Empty #3

Post  guest_01 on Thu Mar 26, 2009 7:59 pm

your best bet for #3 is to do the equation in parts..thats the only way it worked for me..putting the whole thing into ur calculator is most likely gonna give u the wrong answer bc theres too much room for error..so try that

guest_01
Guest


Back to top Go down

Ch 23-1 Quiz Empty 3

Post  3 on Thu Mar 26, 2009 9:34 pm

I cantttttttttttt get 3 at all

i have error i tried to break them down but same thing

3
Guest


Back to top Go down

Ch 23-1 Quiz Empty #3 sucksssss

Post  k8 on Fri Mar 27, 2009 12:46 am

help! still cannot get it right! what was ur numerical answer for #3? i've tried so many times!
A radioactive particle has a lifetime of 3.603 x10-8 s before it decays (dies) after its creation when observed at rest. The particle has a velocity of 2.734 x108 m/s relative to you standing in the laboratory. What is the lifetime of the particle as measured by you (sheet 6,Cool ? Indicate with a positive (negative) sign whether the liftime measured by you when "riding on the particle" is smaller (larger) than your result.

k8
Guest


Back to top Go down

Ch 23-1 Quiz Empty Re: Ch 23-1 Quiz

Post  in respo on Fri Mar 27, 2009 1:44 pm

the only way you get a nonreal number is if you used the first number in placement of the second number

in respo
Guest


Back to top Go down

Ch 23-1 Quiz Empty Re: Ch 23-1 Quiz

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum