A balloon of volume 1500 m 3 and weighing 1650 kg with all its equipment is filled with He (density 0.2 kg m -3 ). If the density of air be 1.3 kgm -3, the pull on the rope tied to the balloon will be

Question

A balloon of volume 1500 m 3 and weighing 1650 kg with all its equipment is filled with He (density 0.2 kg m -3 ). If the density of air be 1.3 kgm -3, the pull on the rope tied to the balloon will be (A) 300 kg (B) 1950 kg (C) 1650 kg (D) zero

Tardigrade Admin · Accepted Answer

Pull on the rope = effective weight =[1650+(1500 × 0.2)-1500 × 1.3] kgf =1650+300-1950=0

Q. A balloon of volume $1500 m^{3}$ and weighing $1650 k g$ with all its equipment is filled with He (density $0.2 k g m^{- 3}$ ). If the density of air be $1.3 k g m^{- 3}$ , the pull on the rope tied to the balloon will be

300 kg

1950 kg

1650 kg

zero

Pull on the rope $=$ effective weight
$= [1650 + (1500 \times 0.2) - 1500 \times 1.3] k g f$
$= 1650 + 300 - 1950 = 0$

Q. A balloon of volume 1500m3 and weighing 1650kg with all its equipment is filled with He (density 0.2kgm−3 ). If the density of air be 1.3kgm−3, the pull on the rope tied to the balloon will be