A ray in plastic has a critical angle of 44.4 deg when trying to enter air. What is the index of refraction for the plastic?
1 answer:
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Answer:
Explanation:
We know that the volume of the material
= mass/density
mass= 360 Kg
density = 1450 kg/m^3
Volume= 360/1450= 0.248 m^3
and Volume = Area× equivalent Diameter
Area= 1200 m^2
⇒Equivalent Diameter= Volume/Area= 0.248/1200=
The question isn't clear enough, I think it ask us to calculate the linear speed of a point at the edge of the DVD.
Now let's imagine we're a point at the edge of the DVD, we're undergoing a circular motion. Each minute we will complete a circular track 7200 times, now we need to know the distance we travel each turn. The perimeter of the DVD, a circular object is:
Know recall that:
We now need to know how much distance is traveled during a minute or 60 seconds:
Finally we divide this result with t=60 seconds:
Where the distance units were named units as the length unit is not specified in this exercise.<span />
Now let's imagine we're a point at the edge of the DVD, we're undergoing a circular motion. Each minute we will complete a circular track 7200 times, now we need to know the distance we travel each turn. The perimeter of the DVD, a circular object is:
Know recall that:
We now need to know how much distance is traveled during a minute or 60 seconds:
Finally we divide this result with t=60 seconds:
Where the distance units were named units as the length unit is not specified in this exercise.<span />