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lilavasa [31]
3 years ago
15

How many nodes, not including the endpoints, are there in a standing wave that is two wavelengths long?.

Physics
1 answer:
Marizza181 [45]3 years ago
7 0

Not including the endpoints, there are 3 nodes.

<h3>What is a node?</h3>

In a wave, a node is a stationary point. For example in a vibrating string of a guitar, the endpoints would be nodes.

But here we need to ignore the endpoints, we only know that the wave has two wavelengths.

For a wave with N wavelengths the number of nodes that are not endpoints is just given by 2*N - 1  (while if we counted the endpoints we would have 2*N + 1).

So in this case we have N = 2, then there are 2*2 - 1 = 3 nodes.

If you want to learn more about waves, you can read:

brainly.com/question/14015797

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your friend did a work of 1717.34 J

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The sum of the work made by your friend and you is equal the change in the kinetic energy, so:

W_a+W_b=\frac{1}{2}mv_f^{2}-\frac{1}{2}mv_i^{2}

Where W_a is the work that you did, W_b is the work that your friend did, m is the mass of the satellite and v_f and v_i are the final and initial speeds

Additionally the work that you did is equal to:

W_a=F.s

Where F and s are vectors. So, the vector s that said the displacement is calculated as:

s = <2.3, 2.6, -11.8> - <3.3, -1.6, 2.0>

s = <-1 , 4.2 , -13.8>

Therefore, W_a is:

W_a=.

W_a=(-400*-1)+(500*4.2)+(250*-13.8)\\W_a=400+2100-3450\\W_a=-950

Then, replacing the values on initial equation and solving for W_b, we get:

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