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10 October, 07:51

A large container of water is sitting on a balance. The weight of the container plus the water is 10 newtons. An object the weight of 7 newtons hanging from a forcemeter is lowered towards the surface of the water. what reading on the force meter would you expect?

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  1. 10 October, 08:47
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    3N

    Explanation:

    Note that when an object is immersed in water it weighs less.

    This means the weight seen is the apparent weight.

    Now in water there is upthrust and is a counter force acting on the object and this force is opposite to the weight of the fluid alongside the container 10N

    The apparent weight is the real weight - the upthrust

    7N-10 = - 3N

    The essence of the negative sign is to show that this force is acting in opposite direction to the weight.

    Note: the upthrust is 10N and it's opposite to the weight of the fluid and the tube on which the object on the force meter is subjected to.
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