An iron ball and an aluminum ball of mass 100 g each are heated to the same temperature and then cooled to a temperature of 20°
1 answer:
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11250J
Explanation:
Given parameters:
Mass of the person = 100kg
Velocity = 15m/s
Unknown:
Kinetic energy = ?
Solution:
The kinetic energy of a body is energy due to the motion of the body.
Kinetic energy = m v²
m is the mass of the body
v is the velocity
Substituting the parameters:
K. E = x 100 x 15² = 11250J
Learn more:
Kinetic energy brainly.com/question/6536722
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Answer:
65.9°
Explanation:
When light goes through air to glass
angle of incidence, i = 35°
refractive index, n = 1.5
Let r be the angle of refraction
Use Snell's law
Sin r = 0.382
r = 22.5°
Now the ray is incident on the glass surface.
A = r + r'
Where, r' be the angle of incidence at other surface
r' = 60° - 22.5° = 37.5°
Now use Snell's law at other surface
Where, i' be the angle at which the light exit from other surface.
Sin i' = 0.913
i' = 65.9°