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Answer:
0.231 N
Explanation:
To get from rest to angular speed of 6.37 rad/s within 9.87s, the angular acceleration of the rod must be

If the rod is rotating about a perpendicular axis at one of its end, then it's momentum inertia must be:

According to Newton 2nd law, the torque required to exert on this rod to achieve such angular acceleration is

So the force acting on the other end to generate this torque mush be:

Answer:
the angle made by this ray with normal will be 45°
Explanation:
given,
refractive index of crown glass = 1.52
refractive index of the water = 1.33
ray of light in water strikes glass at 45°
angle subtended by the light when it reenter water = ?
When light enter in the glass from the water it get bend toward normal because refractive index of glass is more than water.
And when ray comes out of the glass it is parallel to the initial light ray.
hence, the angle made by this ray with normal will be 45°