My Favorite Exam Question

• Autores: Dan Styer
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 53, Nº. 9, 2015, pág. 535
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • My favorite exam question comes from the final exam in an introductory mechanics course: A rolling 31 ton railroad boxcar collides with a stationary flatcar. The coupling mechanism activates so the cars latch together and roll down the track attached. Of the initial kinetic energy, 38% dissipates as heat, sound, vibrations, mechanical deformation, and so forth. How much does the flatcar weigh?