1)Why 2 thin blankets are warmer than a single blanket of double thickness? 2)what do you mean by degree of freedom of a gas ? 3)stainless steel cooking pans are preferred with extra copper bottoms? why? 4)wooden sleepers are provided below rails while laying railway lines .Why? 5)sand is thrown on tracks coversd with snow on hilly area? Why?

Asked by Karthik 5th March 2013, 12:12 PM

Answered by Expert

Answer:

1. as air is trapped in between the layers so it will not allow heat to escape from the body.

2.degree of freedom of gases means the number of independent coordinates required to describe the motion and position of the molecules of that particular gas.

3. as heat conductivity of copper is very high.

Answered by Expert 5th March 2013, 3:50 PM

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Two students started together for their school which is 2 km apart from their hostel and decided to reach in shortest possible time. They have one bicycle which they decided to use in turn as it can carry only one person. Both can walk at one 1 km / hour and both ride the cycle at 4 km / hour. One of them started walking and other started on cycle. At some intermediate point, the student riding the bicycle leaves it and starts walking towards the school. The other student, after walking upto the intermediate point continues his journey on the bicycle. Finally both reach the school simultaneously.

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Total time of their journey is 75 min.
Total time for which one can enjoy the ride is 20 min.
Total time for which one must walk is 55 min.
Total time for which cycle remains unused is 45 min.

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