What is the angle of reflection?
2 answers:
Explanation :
The process in which the object after striking on a reflecting surface bounces back is called reflection. This process is shown by the light and the sound waves etc.
There are two laws of reflection :
- The angle of incidence is equal to the angle of reflection.
- The normal, incident ray and the reflected ray and the point of incidence all lie in the same plane.
From the attached figure, it is clear that the angle of reflection is the angle between the reflected ray and the normal to the reflecting surface. It is denoted by .
Hence, the correct option is (C) " the angle that the reflected ray makes with a line drawn perpendicular to the reflecting surface ".
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Answer:
a) F = 680 N, b) W = 215 .4 J , c) F = 1278.4 N
Explanation:
a) Hooke's law is
F = k x
To find the displacement (x) let's use the elastic energy equation
= ½ k x²
k = 2 / x²
k = 2 85.0 / 0.250²
k = 2720 N / m
We replace and look for elastic force
F = 2720 0.250
F = 680 N
b) The definition of work is
W = ΔEm
W = -
W = ½ k ( ² - x₀²)
The final distance
= 0.250 +0.220
= 0.4750 m
We calculate the work
W = ½ 2720 (0.47² - 0.25²)
W = 215 .4 J
We calculate the strength
F = k
F = 2720 0.470
F = 1278.4 N