aluminum cylinder in alcohol physics question?

Question

An aluminum cylinder weighs 1.01 N. When this same cylinder is completely submerged in alcohol, the volume of the displaced alcohol is 3.86 × 10-5 m3. The apparent weight of the cylinder when completely submerged is 0.731 N. What is the specific gravity of the alcohol?

Answer 1

p= m/V
p'=mg/V=w/V

p'=(1.01 - 0.731 )/(3.86 E-5)
p'= 7230 N/m^3
or
p=p'/g=7230/9.81=737 kg/m^3

SG= p/p (H2O) = 737 /1025=0.7191

Answer 2

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