Introduction|Pulling A Thread From A Fabric|Can You Also Identify Some Fabric ?|Fiber|Some Synthetic Fibers|Where Do These Fibers Come From?|OMR

Introduction|Can You Also Identify Some Fabric ?|Pulling A Thread From A Fabric|Fiber|Where Do These Fibers Come From?|Some Synthetic Fibers|OMR

Introduction|Fibers|Synthetic Fibers|Types Synthetic Fibers|Let's Do It|OMR

When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?

Fibers|Plant Fibers|Where Does This Cotton Wool Come From |Jute|Spinning Cotton Yarn|OMR

Acid rain is known to contain some acids. Name these acids and where from they come in rain ?

Answer the following: (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? (b) An astronaut inside a small spaceship orbiting around the Earth cannot detect gravity. If the space station orbiting around the Earth has a large size, can he hope to detect gravity? (c) If you compare the gravitational force on the Earth due to the Sun to that due to the Moon, you would find that the Sun’s pull is greater than the Moon’s pull. (You can check this yourself using the data available in the succeeding exercises). However, the tidal effect of the Moon’s pull is greater than the tidal effect of Sun. Why?