Block A in the figure (Figure 1) hangs by a cord from spring balance D and is su

Question

Block A in the figure (Figure 1) hangs by a cord from spring balance D and is submerged in a liquid C contained in beaker B. The mass of the beaker is 1.15 kg ; the mass of the liquid is 1.90 kg . Balance D reads 3.35 kg and balance E reads 7.50 kg . The volume of block A is 3.75×10?3 m3 .

Part A

What is the density of the liquid?

Express your answer in kilograms per cubic meter to three significant figures.

Part B

What will the balance D read if block A is pulled up out of the liquid?

Express your answer in kilograms to three significant figures.

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Part C

What will the balance E read if block A is pulled up out of the liquid?

Express your answer in kilograms to three significant figures.

Explanation / Answer

Part A) Let the density of liquid is d kg/m^3.
=>3.75 x 10^-3 x d + 1.15 + 1.90 = 7.50
=>3.75 x 10^-3 x d = 7.50 - 3.05 = 4.45
=>d = 4.45/(3.75 x 10^-3) = 1186.67 kg/m^3

Part B) For the answer of it you have to know the density of Block ? as,
Density of object/Density of liquid = weight of object/(weight of object - apparent loss of weight)

Part C) Reading of E = 1.15 + 1.90 = 3.05 Kg

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