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11111nata11111 [884]

2 years ago

15

"A boat that can travel at 4.0 km/h in still water crosses a river with a current of 2.0 km/h. At what angle must the boat be po

inted upstream (that is, relative to its actual path) to go straight across the river?

1 answer:

IRISSAK [1]2 years ago

8 0

Answer:

30 degrees

Explanation:

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Answer:

1. t = 0.0819s

2. W = 0.25N

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Explanation:

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$v = \frac{\omega}{k}=\frac{2730rad/sec}{172rad/m}\\\\$

v = 15.87m/s

Time taken, $t = \frac{\lambda}{v}$

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2)

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$v = \sqrt{\frac{W}{\frac{m}{\lambda}}}$

mass of string is calculated thus

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$m = \frac{0.0125N}{9.8N/s}$

m = 0.00128kg

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$\omega =$ 0.25N

3)

The propagation constant k is

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$\lambda =$ 0.036 m

No of wavelengths, n is

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n = 36

4)

The equation of wave travelling down the string is

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$without, unit\\\\y(x , t)= Acos[172x + 2730t]$

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