Question

give reason for the following:

5.it is difficult to move on wet marble surface because
....
6. we apply lubricants in doors hinges because...
7. natural gas is considered as an environment friendly fuel because....
8. the nose of a mountaineer bleed at high altitudes because....​

Answer 1

Explanation:

5.it is difficult to move on wet marble surface because The water on a wet marble floor fills the microscopic irregularities on the surface and hence present lesser frictional force. It is therefore difficult to move on a wet marble floor.

6.When we put the oil the rough interlocks between the surface and body are filled by the drops of oil and hence become smooth and then the friction decreases. So, here we can say that if we apply oil on door hinges, the friction will decrease.

7. Natural Gas is a cleaner fuel. It is less harmful to the environment than coal, petrol or diesel as it has less carbon dioxide emissions. The fuel can be easily stored and transferred through pipelines.

8.As you climb higher, the amount of oxygen in the air decreases. This makes the air thinner and dryer, which can in turn cause the inside of your nose to crack and bleed.

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