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qid 9276 · physics

Question: What is the fractional increase of mass for a 600-mi/hr jetliner?

  1. 1.5 × 10^-12
  2. 0.8 × 10^-12
  3. 0.5 × 10^-12
  4. 0.3 × 10^-12
  5. 2.0 × 10^-12
  6. 4.5 × 10^-12
  7. 5.0 × 10^-12
  8. 2.5 × 10^-12
  9. 3.0 × 10^-12
  10. 1.0 × 10^-12

Our answer: C. 0.5 × 10^-12 Source quote machine-checked (at mint)

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How it was answered

Stored formula / worked method, replayed by code

Special relativity, computation. The low-speed fractional increase of mass, and a case where the exact value and the published source's value differ by the source's own rounding.

card: formula · card sha256 f700128e00bcbd1d…

Current source

REA, The Physics Problem Solver, PROBLEM 939, pages 976 to 977 -- "beta = v/c = 2.7x10^4 / 3x10^10 = 10^-6" and "Delta m / m_0 = (1/2) beta^2 = .5 x 10^-12". Page image read directly, archive.org item physics.problems, leaf 994, printed page 977; same text in items physicsproblemso00rese and physics0000unse_z1q3.

Source weak (edition_page)

retrieved 2026-09-16T22:14:06.748Z

addendum formula_qid9276.formula_ADDENDUM_source · sha256 b4ef10ba5a657845…

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