| Question #815 | |
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| You are approaching Chatham Strait from the south in foggy weather. You have Coronation Island and Hazy Islands on the radar. Suddenly the radar malfunctions. You then resort to using whistle echoes to determine your distance off Coronation Island. Your stopwatch reads 16.3 seconds for the echo to be heard. How far are you off Coronation Island? | |
| A) 1.0 mile | |
| B) 1.5 miles | |
| C) 2.0 miles | |
| D) 2.5 miles | |
| Posted: 03 Apr 2022 02:53 UTC | Post #1 |
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| MyckenzieToler Deck |
Member Total Posts: 15 |
| Hopefully someone out there finds this useful. Sound in dry air travels 1116.45 ft per a second in dry air. Step 1: Convert feet to asking distance asked. In this case it’s in miles. So 1116.48(you must memorise this #)/6076.11(found in bowditch conversion table if you don’t have it on the top of your head). =.18374 Step 2: Multiply this against HALF the time in seconds. Makes sense because it’s gotta go there and then back. So in this case it would 8.15*.18374= 1.49 nm (ANS) Hope that makes sense! |
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