When a piece of wood is suspended from the hook of a spring balance, it reads $70 g f$ . The wood is now lowered into the water which results in floating the wood. What reading do you expect on the scale of spring balance?

70gf

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Zero

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35 gf

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7gf

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Solution

The correct option is B Zero
When the wood is lowered into water, the wood will float in water.
So, its apparent weight = weight of the block in air $-$ upthrust
Now, the piece of wood is floating implies that the upthrust is equal to the weight of the block in air.
Thus, the apparent weight of a floating body is zero. The spring balance will read zero.

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When a piece of wood is suspended from the hook of a spring balance, it reads 70gf. The wood is now lowered into the water which results in floating the wood. What reading do you expect on the scale of spring balance?

When a piece of wood is suspended from the hook of a spring balance, it reads $70 g f$ . The wood is now lowered into the water which results in floating the wood. What reading do you expect on the scale of spring balance?