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When the door of the Chapel of the Mausoleum in Hamilton, Scotland, is slammed shut, the last echo heard by someone standing just inside the door reportedly comes 21.0 s later.
(a) If that echo were due to a single reflection off a wall opposite the door, how far from the door would that wall be (in km)?
(b) If, instead, the wall is 27.1 m away, how many reflections (back and forth) correspond to the last echo? Assume the speed of sound is 345 m/s.
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You are to drive to an interview in another town, at a distance of 300 km on an expressway. The interview is at 11:15 a.m. You plan to drive at 100 km/h, so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first 110..
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The box is cubical, measuring 0.390 m on a side, and the thickness of the walls is 3.00 10-2 m. In one day, 2.90 106 J of heat is conducted through the six walls. Find out the thermal conductivity of the box.
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