If V1 = 20m/s V2 = 2 m/s and density S=1000 kg/m3 then P1-P2 will be :- > a) 1980 N/m² b) 1970 N/m² c) 1960 N/m² d) 1990 N/m²
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Explanation:
We analysed this problem from the reference frame of elevator.
Total buoyant force on the block,
F
B
=(
5
2
Vρ
2
+
5
3
Vρ
1
)(g+a)
For equilibrium,
Fa=T+Vd(g+a)
or T=F
B
−vd(g+a)=(g+a)V[
5
2
ρ
2
+
5
3
ρ
1
−d]
T=(10+
2
10
)×10
−3
[
5
2
×1500+
5
3
×1000−800]=6N
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