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A Problem from Specific Heat of Gases

Priyanshi Gaur posted”:

“A sample of air weighing 1.18g occupies 1000 cubic cm when kept at 300 K at 1000000 Pa.When 2 cal of heat is added to it at constant volume, its temperature increases by 1 degree celcius.Calculate the amount of heat needed to increase the temperature of air by 1 degree celcius at constant pressure if the mechanical equivalent of heat is 4.2*10000000 erg/cal.”

Hints:

Remember that

Cp/Cv = γ

Cp-Cv=R

How earths tilt causes seasonal change?

Zeenath PV asked: how earths tilt causes seasonal change?

Answer:

image The climate on earth is mainly determined by the distance from sun and how much sunlight (and heat radiations) is received by earth. The relative duration of day and night as well as the climate is greatly dependant on the tilt of the earth’s axis with respect to its plane of orbit around sun and the elliptical shape of earth

Please follow these links to read more:

  1. http://www.msnbc.msn.com/id/3077384/
  2. http://en.wikipedia.org/wiki/Season
  3. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980211f.html
  4. http://www.eoearth.org/article/Causes_of_climate_change
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