Question 138: Properties of Matter

Question

A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s–2. The density of water is
1 gm cm–3 and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980
cm/s2).

Accepted Answer

B - mg = ma
$$ \Rightarrow $$ m = $${B \over {g + a}}$$
= $${{V{ho _w}g} \over {g + a}}$$
= $${{V{ho _w}} \over {1 + {a \over g}}}$$
= $${{{4 \over 3}\pi {{\left( 1 ight)}^3} 	imes 1} \over {1 + {{9.8} \over {980}}}}$$
= 4.15 gm

Answer

1.52 gm

Answer

4.51 gm

Answer

3.15 gm

Answer

4.15 gm

Properties of Matter

A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s–2. The density of water is 1 gm cm–3 and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980 cm/s2).

Choose the correct answer: