If a light Ray is reflected off the shiny surface at 170 degrees at what angle did the light-ray first strike the surface
2 answers:
Answer:
The light-ray first strike the surface at angle of 5 degrees.
Explanation:
It is given that,
If a light Ray is reflected off the shiny surface at 170 degrees. We have to determine the light- ray first strike the surface. It is based on the laws of reflection which states that the angle of incidence is equal to the angle of reflection.
Here, the angle between the reflected ray and the surface is 170 degrees. So, it is clear that the angle between the incident ray and the surface is 5 degrees.
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Answer:
v = 14.32 m/s
Explanation:
According to the principle of conservation of linear momentum, both the momentum and kinetic energy of the system are conserved. Since the two balls are in the same direction of motion before collision, then;
+
= (
+
) v
0.035 × 12 + 0.120 × 15 = (0.035 + 0.120) v
0.420 + 1.800 = (0.155) v
2.22 = 0.155 v
⇒ v =
= 14.323
The velocity of the balls after collision is 14.32 m/s.