First slide

Fluid statics

Question

Balloon of total mass 1000 kg floats motionless over the earth's surface. If 100 kg of sand blast are thrown over board, the balloon starts to rise with an acceleration of:

Easy

A

10 m/s²
B

9.8 m/s²
C

1.09 m/s²
D

with none of three values

Solution

Acceleration $= \frac{F_{net}}{m} = \frac{W - U}{m} = \frac{(1000 - 900)}{900} g = \frac{g}{9} = 1.09 m / s^{2}$

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