A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm / s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).

Question

A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm / s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne). (A) 3 (B) 9 (C) 12 (D) 18

Tardigrade Admin · Accepted Answer

F =( dm / dt ) v =(10 g /5 s )(4.5 ( cm / s ))=9 ( gcm / s 2)=9 dyne

Q. A balloon has mass of $10 g$ in air. The air escapes from the balloon at a uniform rate with velocity $4.5 c m / s$ . If the balloon shrinks in $5 s$ completely. Then, the average force acting on that balloon will be (in dyne).

3

9

12

18

$F = \frac{d m}{d t} v$
$= \frac{10 g}{5 s} (4.5 \frac{c m}{s}) = 9 \frac{g c m}{s ^{2}} = 9$ dyne

Q. A balloon has mass of 10g in air. The air escapes from the balloon at a uniform rate with velocity 4.5cm/s. If the balloon shrinks in 5s completely. Then, the average force acting on that balloon will be (in dyne).

3

9

12

18

F=dtdm​v =5s10g​(4.5scm​)=9s2gcm​=9 dyne

Q. A balloon has mass of $10 g$ in air. The air escapes from the balloon at a uniform rate with velocity $4.5 c m / s$ . If the balloon shrinks in $5 s$ completely. Then, the average force acting on that balloon will be (in dyne).

$F = \frac{d m}{d t} v$
$= \frac{10 g}{5 s} (4.5 \frac{c m}{s}) = 9 \frac{g c m}{s ^{2}} = 9$ dyne