Question

Can someone please verify my answer to this special relativity question?

Answer 1

im not very good at this stuff but if i were to really look at it and take a ood guess i would say D

Answer 2

@Warriorz13 it's not a multiple choice question...

Answer 3

then whats with the a b c d thing?

Answer 4

@Warriorz13 "evaluate the following"

Answer 5

Hi, I just looked through your work, it all looks correct to me, except possibly your units for momentum in part c - momentum unit can be energy * time, I think, so you're missing the time unit (maybe)

Answer 6

Thanks for taking a look @ProfBrainstorm !
A friend of mine (who is in the same class) got a different answer for momentum, so I'll definitely re-do it.

Answer 7

I think your numbers are correct, should just be eV s for the unit instead of just eV

Answer 8

At first glance, I don't think the units are incorrect - the units for the speed of light are in meters per second, so they cancel with the units for u. Leaving gamma (no units) times 938.78 MeV

Answer 9

I am wrong, managed to confuse myself, the unit of momentum can be written as force * time, not energy * time

Answer 10

so your momentum unit should be eV s/m

Answer 11

I can see where you went wrong, you have left in a unit of meter/second after the velocity cancelled - you forgot to cancel the unit of speed in one of the factors

Answer 12

It's not 0.9476038m/s, it's just dimensionless 0.9476038 when the c has been cancelled

Answer 13

Ahh, okay I see, yes I forgot to cancel the m/s.

I think I also made this way too complicated

I calculated m up top for 2000 protons: 3.34x10^{-24} kg

Momentum is just kg • m/s

Answer 14

↓^ kg * (m/s)

Answer 15

: )

Answer 16

Oh physics, you so silly.

Answer 17

sure, you can write momentum as kg . m/s, or as energy.time/distance they're exactly equivalent
the second choice seemed more natural in the context of your question

Answer 18

And yet again @ProfBrainstorm comes to my rescue :)
Seriously, thank you so much! Your feedback is always fantastic.

Answer 19

my pleasure