Define thrust- What is the up thrust experienced by a balloon of volume 120m3 filled with hydrogen- The density of air - 1-140 kg-m3 and density of hydrogen - 0-081kg-m3 at room temperature- What is the maximum weight this balloon can lift- -3 MARKS-

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Standard VIII

Physics

Moment of Force

Define thrust...

Question

Define thrust. What is the up thrust experienced by a balloon of volume 120 $m^{3}$ filled with hydrogen. The density of air = 1.140 $\frac{k g}{m^{3}}$ and density of hydrogen = 0.081 $\frac{k g}{m^{3}}$ at room temperature. What is the maximum weight this balloon can lift? [3 MARKS]

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Solution

Definition: 1 Mark
Problem: 2 Mark

1. Thrust is a force or a push. When a system pushes or accelerates mass in one direction, there is a thrust (force) just as large in the opposite direction.
2. Let densities of air and hydrogen be $ρ_{a i r}$ =1.14 and $ρ_{h y d r o g e n}$ =0.081 respectively.

Let volume of balloon V= 120 $m^{3}$

Net force on it = Bouyant Force – Gravitational Force

= V $ρ_{a i r}$ g - V $ρ_{h y g r o g e n}$ g

= V( $ρ_{a i r}$ - $ρ_{h y g r o g e n}$ )g

= V(1.14-0.081)g

=120(1.14-0.081)(9.81)

=1246.6 N

This is the maximum weight that can be carried by balloon.

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Define thrust. What is the up thrust experienced by a balloon of volume 120m3 filled with hydrogen. The density of air = 1.140 kgm3 and density of hydrogen = 0.081kgm3 at room temperature. What is the maximum weight this balloon can lift? [3 MARKS]

Define thrust. What is the up thrust experienced by a balloon of volume 120 $m^{3}$ filled with hydrogen. The density of air = 1.140 $\frac{k g}{m^{3}}$ and density of hydrogen = 0.081 $\frac{k g}{m^{3}}$ at room temperature. What is the maximum weight this balloon can lift? [3 MARKS]