Answer:Number of waves =2.2
Explanation:
The frequency of A wave is defined as the number of waves moving a fixed point per second which is given as
f=
F= Frequency
N= number of waves
t= time
We first find the frequency
Given velocity of the wave, v = 13m/s
and wavelength, λ as 6meters(distance between two consecutive crest)
, we fiind the frequency using
v= f λ
frequency = v / λ
= (13m/s ) / 6
=2.16s-1
f = 
2.16s₋¹= 
Therefore N, Number of waves = 2.16 waves rounded up to 2.2 waves
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Answer:
Part a)

Part b)

Part c)

Explanation:
Part a)
As we know that there is no external torque on the system of two twins
so here we will use



Part b)
Since angular momentum is conserved here as there is no external torque
so we will have



Part c)
Work done by both of them = change in kinetic energy
so we have




Answer: So they can find your mistakes that you made you skipped over
Explanation: