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Upthrust is equal to the weight of displaced liquid - class-VII
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A bob's weight is measured by a spring balance. Its volume is $10 cm^3$. In vacuum it measures $80 g$. What does it weigh in water?
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A
$70 g$
💡 Explanation:
Weight of bob $= 80g/1000 N$ where $g$ is acceleration due to gravity
Weight of water displaced $= 10\times1\times g/1000 = 10g/1000 N$
Apparent weight$ = 80g/1000 - 10g/1000 = 70g/1000 N$
Weight measured $= 70/1000kg = 70 g$