Infrared radiations from the Sun have short wavelength (high frequency) s they are emitted from the surface of the sun at high temperature.These radiations have more energy due to high frequency and hence they can penetrate through a glass or plastic house. But the radiations reflected or emitted from the plants in the house are of longer wavelength so they cannot penetrate through the house. So heat is retained inside the house and temperature increases.
This rise in temperate is called green house effect
In uniform circular motion, 1. Speed is constant. 2. Velocity is variable and acts along tangential direction at a point. 3. Centripetal Force and acceleration act along the radius towards the centre if the circular path. 4. Centrifugal force appears to act radially outwards. It is a virtual ,fictitious force, not a real force.
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