RedEnchilada (notice the lack of a space) (redenchilada)'s status on Tuesday, 29-Jan-13 04:32:29 UTC

  1. RedEnchilada (notice the lack of a space) RedEnchilada (notice the lack of a space)

    @pokestrike A submarine moving at 6m/s sends out a sound wave at 4300Hz. It reflects off of a torpedo and arrives back at the submarine 500ms later at a frequency of 4460Hz. Assuming the torpedo is moving parallel to the submarine's current course, how long does the crew in the submarine have before they're all blown to pieces? Assume the speed of sound in water is 1500m/s.

    Tuesday, 29-Jan-13 04:32:29 UTC from StatusNet Android in context