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frez [133]
3 years ago
14

A wave has a wavelength of 9 mm and a frequency of 14 hertz. What is its speed?

Physics
1 answer:
lesantik [10]3 years ago
5 0
Wavespeed = frequency x wavelength
= 14 x 9
= 126 mm/s
= 0.126 m/s
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Help with this question plz and show how you got it :) tysm!
spayn [35]
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Beautiful.
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3 years ago
To stretch a certain nonlinear spring by an amount x requires a force F given by F = 40 x − 6 x 2 , where F is in Newtons and x
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Answer:

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∆U = - ∫-Fdx

=  ∫F.dx

Since F = 40x - 6x² and x moves from x = 0 to x = 2 m, we integrate thus, ∆U =  ∫₀²F.dx

=  ∫₀²(40x - 6x²).dx

=  ∫₀²(40xdx - 6x²dx)

=  ∫₀²(40x²/2 - 6x³/3)

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= [(20(2)² - 2(2)³) - (20(0)² - 2(0)³)

= [(20(4) - 2(8)) - (0 - 0))

= [80 - 16 - 0]

= 64 J

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