<span>An angle of refraction is the angle between the refracted ray and the "Normal ray"
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Answer:
3 mps
Explanation:
So we want to convert this into a unit rate. So we take 30/10=3. So 3 meters per second.
Answer:
Using insulating materials is the best way to prevent heat transfer by conduction and convection. Insulating materials are poor conductors of thermal energy and also limit the movement of air in spaces, reducing convection. Insulation slows the rate at which unwanted energy enters the home in the summer.
Explanation:
Easy peasy.
Answer:

Explanation:
Given that,
Force acting on an object, F = 30 N
Mass of the object, m = 4 kg
It is moving with a constant velocity of 2 m/s across a level surface.
We need to find the coefficient of friction between the object and the surface. Let it is μ. Force in terms of coefficient of friction is given by :
F = μ N, Where N is normal force, N = mg

So, the coefficient of friction between the object and the surface is 0.75.