11. A disk 8.00 cm in radiu: rotates at a constant rate of 1200 revinin about its central axis Determine (a) its angular speed i
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Answer:
a The diagram of the situation is shown on the first uploaded image
b the angle of incidence beam striking the water is
c the angle of refraction beam striking the water is
d The angle the refracted beam make with respect to the horizontal is
e The height of the target above sea level is
Explanation:
From the diagram we see that the angle of the beam striking the water is
According to Snell's law
Where is the refractive index of water = 1.333
is the angle of incidence
is the refractive index of air = 1
r is the angle of refraction
Substituting values accordingly
Making r the subject of the formula
looking at the diagram we can see that to obtain the angle the refraction beam makes with the horizontal by subtracting the angle refraction from 90°
i.e °
From the diagram we see that the height target above sea level can be obtained by this relation
Where h is the is the height
