# First HW - Two firecrackers explode at the same place in the lab

1. Apr 10, 2014

### crazyapeguy

1. The problem statement, all variables and given/known data

1. Two firecrackers explode at the same place in the laboratory and are separated by a time of 3 years as measured on a lab clock.

(a) What is the spatial distance between these two events in a rocket in which the events are separated in time by 5 years as measured on rocket clocks?

(b) What is the relative speed of the rocket and the lab frames?

2. Relevant equations

? - I am not exactly sure, but, I believe one relevant equation is:
t = γ (τ - βx)
x = γ (x - βτ)

3. The attempt at a solution

Trying to find x:

t/γ = τ - βx

βx = -t/γ + τ

x = -t`/γ + τ
__________
β

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Thank you so much for any help. This is my first Physics course so if you don't mind could you assume I know literally nothing, like less than an ant?
My problem is I am thinking: what is the velocity? I am really lost/confused

2. Apr 11, 2014

### Simon Bridge

Welcome to PF;
It looks like you have been doing a course in special relativity. You should not be doing that course without a solid grounding in Newtonian mechanics.

If you really know so little, then I'd have to give you all that material again - which would take too long and be expensive. Do you have notes and coursework? A text book? Perhaps you should review those? You can also peruse the various courses online.