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QPage 457: Q13: HC Verma: Concepts of Physics - Volume 2 The Special Theory of Relativity Page 457: Q13 Solution: When a rod moves at a relativistic speed v, its mass…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often mistake the invariant rest mass for the speed‑dependent relativistic mass, leading them to claim the rod’s mass stays the same or changes arbitrarily; remember that in special relativity the moving mass is $m=\gamma m_0$, so only the relativistic mass grows by the factor $\gamma$, while the rest mass $m_0$ remains unchanged.
When a rod moves at a relativistic speed v, its mass ________________.
Multiple Choice Options
- A must increase by a factor of
- B may remain unchanged
- C may increase by a factor other than
- D may decrease
Step-by-Step Verified Solution
**Answer:** (a) must increase by a factor of _.
**Step-by-Step Explanation:**
Relativistic mass m = _m_.
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