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Phoenix [80]
3 years ago
6

A boat travels west at 20km/h. The journey lasts 3hours. How far has the boat travelled? *

Physics
2 answers:
Novosadov [1.4K]3 years ago
4 0
Correct answer is (B) 60Km
fomenos3 years ago
3 0

Answer:

B)60km[W]

Explanation:

The boat travels 20km/h. So every hour the boat goes 20 miles. So if one hour equals 20km. Then 3 hours will be 3*20km which equals 60km. The boat is also going west. So you should consider putting that in your answer as well. So the answer would be B)60km[W].

Hope that helps!

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A 0.325 g wire is stretched between two points 57.7 cm apart. The tension in the wire is 650 N. Find the frequency of first harm
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Answer:

f = 931.1 Hz

Explanation:

Given,

Mass of the wire, m = 0.325 g

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Frequency for the first harmonic = ?

we know,

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now,

v =\sqrt{\dfrac{650}{0.563\times 10^{-3}}}

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The wire is fixed at both ends. Nodes occur at fixed ends.

For First harmonic when there is a node at each end and the longest possible wavelength will have condition

          λ=2 L

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we now,

       v = f λ

      f = \dfrac{v}{\lambda}

      f = \dfrac{1074.49}{1.154}

             f = 931.1 Hz

The frequency for first harmonic is equal to f = 931.1 Hz

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