Question
Tungsten is used for the manufacture of the filament of
an electric bulb, because –Solution
Tungsten is used because it has the highest melting point of all the metallic elements. It melts at 3410 degrees Celsius. When currentpassesthroughthefilamentitheatsitup. Whenthefilamentreachesacertaintemperature itstartstogiveofflight,that'showwegetalight bulb. The first successful light bulb filaments were made of carbon(fromcarbonizedpaper or bamboo).
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'.