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World Year of Physics

 
Year 2005 is declared as world year of Physics.  Year 2005 is the 100'th anniversary of the, "Miraculous Year" 1905.  In 1905, world's most famous physicist, "Albert Einstein" wrote articles related to three fields: relativity, quantum theory and Brownian motion.
 
More details about the, "World Year" can be found at http://www.wyp2005.org/ . 

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A man starts walking from the point P (-3, 4) ....

A man starts walking from the point P (-3, 4), touches the x-axis at R, and then turns to reach at the point Q (0, 2). The man is walking at a constant speed. If the man reaches the point Q in the minimum time, then $50 [(PR)^2 + (RQ)^2 ]$ is equal to _ _ _ _ . Solution For time to be minimum at constant speed, the directions must be symmetric. In other words, the angles made by PR and RQ with the vertical must be the same just like in the law of reflection in optics. $tan \theta = \frac {MP}{MR} = \frac {NQ}{NR} $ $\Rightarrow \frac {3-r}{4} = \frac {r}{2}$ $\Rightarrow r=1 $ So, $R \equiv ( - 1,0)$ Now, $50(PR^2+RQ^2)=50[(4+16)+(1+4)]=1250$
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