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# A beaker of mass 1.3 kg containing 2.8 kg of water rests on a scale.?

. A 3.4 kg block of a

metallic alloy of density 4100 kg/m3

is suspended from a spring scale and is submerged

in the water of density 1000 kg/m3

as shown in the figure. What does the hanging scale read? The

acceleration of gravity is 9.8 m/s

2

.

Answer in units of N

2. What does the lower scale read?

Answer in units of N.

### 2 Answers

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- NCSLv 71 month ago
The total weight is

W = (3.4 + 2.8 + 1.3)kg * 9.8m/s² = 73.5 N

so the two scales must total this amount.

top scale reads weight of block less buoyant force:

Ft = 3.4kg * 9.8m/s² * (4100 - 1000) / 4100 = 25 N ◄

which means that the bottom scale reads

Fb = (73.5 - 25) N = 48 N ◄

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- Anonymous1 month ago
upper scale :

3.4*9.806*(4.1-1)/4.1 = 25.2 N

lower scale :

9.8*(3.4+2.8+1.3) = 73.5 N

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