Posted in Science Corner, tagged Oil evaporation on March 9, 2008 | Leave a Comment »
Oil evaporation
Unlike water, why do coconut oil and other edible oils not evaporate?
C. S. Tamil Selvan
Pothanur, Tamil Nadu A liquid consists of molecules (or atoms) which perpetually move around. The freedom with which they move depends on the size, weight and shape of the molecules and more importantly on the strength of [...]
Posted in Science Corner, tagged ball and pendulam on January 31, 2008 | Leave a Comment »
Q: If a pendulum can swing to and fro endlessly, why does a ball thrown from a height not keep bouncing the same way?
A: Any moving body continues to move unless it is opposed by a force like that of friction. A pendulum, in principle, should perpetually oscillate to and fro if the air resistance [...]
Posted in Science Corner, tagged bubble pricking, Science Corner on January 26, 2008 | Leave a Comment »
Pricking rain drop
Why does a rain drop prick us when we are moving on bike but does not when we walk?
The rain-drops arrive at the surface of earth after they condense from the cloud at a fairly high altitude. As they move down under the action of the earth’s gravity, their velocity increases.
However, friction [...]
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