Relativity According to the Theory of Relativity, the length L of an object is a function of its velocity v with respect to an observer. For an object whose length at rest is 10 m, the function is given by
where c is the speed of light (300,000 km/s).
- (a) Find L(0.5c), L(0.75c), and L(0.9c).
- (b) How does the length of an object change as its velocity increases?
(a)
The length of object when the velocity of the object is
Answer to Problem 75E
The length of object when the velocity of the object is
Explanation of Solution
Given:
The length of the object is a function of its velocity and the length of the object at rest is
The length of the object at velocity
Calculation:
The length of the object at velocity
Substitute
Substitute
Substitute
Thus, the length of object when the velocity of the object is
(b)
The variation of length of object according to the increase in velocity.
Answer to Problem 75E
The length of the object decreases as the velocity of object increases.
Explanation of Solution
Given:
The length of the object is a function of its velocity and the length of the object at rest is
The length of the object at velocity
Calculation:
The length of the object at velocity
If the velocity of object increase then the term
Thus, as the velocity increases the length of the object decreases.
Chapter 2 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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