As an air bubble rises from the bottom of a large water storage tank to free surface of water ,the radius of the air bubble increases from 6mm to 10mm.the temperature of the water at the surface is 42°c and its bottom is 27°c.find the depth of the water tank.(take density of water=1g/cm^3, g=10m/s^2 , 1atm=760mm of hg, density of mercury=13.6g/cm^3)

How do you find the Maclaurin series for tanx?

Why is Axiom 5, in the list of Euclid’s axioms, considered a ‘universal truth’? (Note that the equation is not about the fifth postulate.)

The smallest composite number is ______.

(a) 2

(b) 4

(c) 1

(d) None of these

Find the arithmetic mean of the first ten odd natural numbers.

A boat goes 24 km upstream and 28 km downstream in 6 hours. It goes 30 km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is

A. 10 km/hr

B. 4 km/hr

C. 14 km/hr

D. 6 km/hr