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18/09/2020 4:40 pm
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A air bubble of radius 1 cm in water has an upward acceleration of 9.8 cms–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).
(1) 4.15 gm
(2) 1.52 gm
(3) 4.51 gm
(4) 3.15 gm
1 Answer
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18/09/2020 4:44 pm
(1) 4.15 gm
Explanation:
Fb - mg = ma
Fb = m(g + a)
= 4/3πr3ρg = m(g + a)
m = 4/3π(1)g = m(980 + 9.8)
m = 4.15