Question
Stars in the sky appear to twinkle due to
–Solution
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
Find the value of the given expression-
(4x+4 -5× 4x+2) / 15×4x – 22×4x
If x2 – 10x + 20 = 0, then find the value of (x – 3)2 + 1/(x – 3)2
If x + y = 4 and (1/x) + (1/y) = 24/7, then the value of (x3 + y3).
If x, y and z are real numbers such that (x-5)2+(y-8)2+(z-12)2= 0 then (x+y+z) is equal to
If x + y = 12 and x² + y² = 74, find xy.
If p = 27 - q - r and pq + r(q + p) = 168, then find the value of (p² + q² + r²).
If (x + y) = 6 and (x2 + y2) = 20, then the value of (x – y)2 is equal to:
A takes 8 hours more than the time taken by B to cover a distance of 160 km. If A doubles his speed. he takes 3 hours more than B to cover the same dist...
If x:y:z = 3:4:6, and (5x + 3z) = 132, then find the value of '3y'.
