If a light ray from a candle strikes a mirror at an angle of 40° with the normal, at what angle will the ray reflect?
1 answer:
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Answer:
28,400 N
Explanation:
Let's start by calculating the pressure that acts on the upper surface of the hatch. It is given by the sum of the atmospheric pressure and the pressure due to the columb of water, which is given by Stevin's law:
On the lower part of the hatch, there is a pressure equal to
So, the net pressure acting on the hatch is
which acts from above.
The area of the hatch is given by:
So, the force needed to open the hatch from the inside is equal to the pressure multiplied by the area of the hatch:
The relationship between wavelength 
, frequency f and speed of light c for an electromagnetic wave is
Using the data of the problem, we find
Using the data of the problem, we find