1. Silk fibre is used to manufacture parachute. Why?
2. Why a person is covered with a blanket when the clothes of that person catch fire?
3. Why do we see white colour in Newton's disc, when we rotate it very fast?
Answers
Answer:
Parachute canopies were first made of canvas. Silk proved to be more practical because it was thin, lightweight, strong, easy to pack, fire resistant, and springy. During World War II, the United States was unable to import silk from Japan, and parachute manufacturers began using nylon fabric.
Answer:
Ans1=Parachute canopies were first made of canvas. Silk proved to be more practical because it was thin, lightweight, strong, easy to pack, fire resistant, and springy. During World War II, the United States was unable to import silk from Japan, and parachute manufacturers began using nylon fabric.
Ans2= Why is the person caught in fire, is covered with a blanket? If the clothes of a person catch fire, he is immediately wrapped in a thick blanket. The blanket cuts off the supply of air i.e. the supporter of combustion and hence the fire is put off.
Ans3= We see white colour in Newton's disc because of the fact that white light is made up of 7 rainbow colours. And, a Newton disc have parts of different colours. As we rotate our sees the light coming from that colours as combined and it appers white.