Question

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Answer 1

answer1) a)we know the formula

m=$\rho$V=1060kg/m³*6.2*10^-3m³=6.57 kg

and we know weight

W=mg=6.57*9.8m/s²=64N

b) and the percentage=(64/750)*100=8.5%

answer2)

here we have $\Delta$P=$\rho$gh=1060kg/m³*9.8m/s²*1.43=1.485*10⁴Pa

so answer is 1.485*10⁴Pa

answer3)

a) we know the formula

Q=Av, Q=V/t=10*10^-3/31=0.32258*10^-3

so v=Q/A=0.32258*10^-3/3.1*10^-4=1.04m/s

b) from continuity eqn we know

A1v1=A2v2

v2=A1v1/A2..........1)

here A2=A1/2

so eqn 1 becomes

v2=2v1 ( A1 cancels out)

v2=2*1.041=2.08 m/s