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ruslelena [56]
3 years ago
5

A boat takes 4.0 h to travel 36 km down a river, then 5.0 h to return.how fast is the river flowing

Physics
1 answer:
dem82 [27]3 years ago
5 0
<span>Let us refer to boat speed as X and water speed as Y On the way down the stream, the water speed is added to the speed of the boat: speed of the boat (X) + water speed (Y) is 9km/h When the boat is moving upstream, water speed is taken away from the speed of the boat: Speed of the boat (X) - water speed (Y) is 7.2 km/h Therefore: X + Y = 9 : X - Y = 7.2 2X = 16.2 X = 8.1 X + Y = 9 8.1 + Y = 9 Y = 0.9 The river is flowing at 0.9 km/h</span>
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3 years ago
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5 0
2 years ago
In a pig caller can produce a sound intensity level of 107 dB. How many pig callers would be needed to generate an intensity lev
myrzilka [38]

Answer:

20 pig callers

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we have:

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Taking the logarithm function;

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5 0
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