Q. A 3.2 m diameter balloon is filled with Helium. The total weight of balloon, gas and pay load is 10 kg kg. In an isothermal atmosphere having conditions identical to N.T.P. the balloon will rise to a height of about

• (A) 6000 m
• (B) Principle of dynamics
• (C) D' Alembert's principle
• (D) Nowton's law