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JAMB Physics 2016 Paper

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Question : 39

Total: 48

A body which weighs 50N in air displaces 3.7kg of water when partially immersed in water. Calculate the upthrust on the body?

8.7N
37.0N
87.0N
13.0N

Solution:

Concept:

Upthrust is equal to the weight of the water displaced by the body.

Explanation:

Mass of water displaced is

3.7\, \text{kg}

.

Upthrust is the weight of this displaced water.

Using

g = 10\, \text{m/s}^2

,

Upthrust

= \text{mass} \times g = 3.7 \times 10 = 37.0\, \text{N}

.

Therefore, the correct option is B.

Answer:

37.0\, \text{N}

(Option B).

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