Question

Find what time interval should separate the markings of coordinates of the rod's ends in the frame $K$ for the difference of coordinates to become equal to the proper length of the rod.

Answer 1

Given:A rod $AB$, velocity of rod $v$.

To find: $△t$ for difference in coordinates equal to Length of rod.

Concept: velocity, $v=\frac{△x}{△t}$

Solution: For this question, the condition is $△x=l$

hence, $△t=\frac{△x}{v}$

which gives, $△t=\frac{l}{v}$