NEWTON'S UNIVERSAL LAW OF GRAVITATION

ECHO IN LIVING ROOM

Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.

UNIFORM CIRCULAR MOTION

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.

The magnification produced by a convex lens is -5. What is understood by this value?

Magnification is -5: The negative magnification means the image is real and the absolute value(without negative sign) of magnification (5) indicates that the image is real and inverted.

PHYSICS

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