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When a container of water is placed on a laboratory scale, the scale reads 120 g. Now a 20-g piece of copper (of density 8.9 g/cm 3) is suspended from a thread and lowered into the water, not touching the bottom of the container. What will the scale now read?
A.122 g B. 140 g C.120 g D.112 g E.138 g

Respuesta :

Answer:

A) 122 g

Explanation:

volume of water displaced

=\frac{20}{8.9}\\

= 2.247 cc

weight of water displaced = 2.247 g wt

upthrust = 2.247 g wt

Reaction of upthrust acting in downward direction = 2.247 g wt

reading of scale = 120 +2.247 = 122.247 g