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Longitudinal Stress

A bob's weigh...

Question

A bob's weight is measured by a spring balance. Its volume is $10 c m^{3}$ . In vacuum it measures $80 g$ . What does it weigh in water?

70 g

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80 g

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90 g

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76 g

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Solution

The correct option is A $70 g$
Weight of bob $= 80 g / 1000 N$ where $g$ is acceleration due to gravity
Weight of water displaced $= 10 \times 1 \times g / 1000 = 10 g / 1000 N$
Apparent weight $= 80 g / 1000 - 10 g / 1000 = 70 g / 1000 N$
Weight measured $= 70 / 1000 k g = 70 g$

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