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1. a star is observed from two diametrically opposite points P & Q on earth , the angle 'x' subtended at the star by the two directions of observations is 1 degree 54 minutes . given the radius of earth 0.638x10 raised to 7.compute the distance of the star from earth . 2. by using dimensional analysis derive an expression for time period off a pendulum.

Asked by Subiya Khan 11th October 2013, 11:21 AM
Answered by Expert
Answer:
1) We have
? = 154' = 114' = 114 60" 4.85 10-6 rad = 3.32 10-2 rad
 
The distance D of star from earth is D = d/?
Here, d is diameter of earth = 1.276 107 m
 
Thus, we have
 
 
2) Let us say that time period depends on l, g and m as
 
T = k lx gy mz
 
Consider dimensions of both sides of above equation
 
k is not found by dimensions. We have, K = 2 ?
Answered by Expert 11th October 2013, 1:19 PM
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