110 kg/m^3 181 kg/m^3 134 kg/m^3 161 kg/m^3 What force does the water exert (in
ID: 1450288 • Letter: 1
Question
110 kg/m^3 181 kg/m^3 134 kg/m^3 161 kg/m^3 What force does the water exert (in addition to that due to atmospheric pressure) on a submarine window of radius 44.0 cm at a depth of 9400 m in sea water? The density of sea water is 1025 kg/m^3. 5.74 Times 10^7 N 5.74 Times 10^11 N 2.87 Times 10^11 N 1.83 Times 10^7 N 2.87 Times 10^7 N A crane lifts a steel submarine of density 7800 kg/m^3 and mass 20,000 kg. What is the tension in the lifting cable when the submarine is submerged in water of density 1000 kg/m^3, and when is entirely out of the water? 2.0 Times 10^5 N, and 1.7 Times 10^5 N 1.7 Times 10^5 N, and 2.0 Times 10^5 N 2.6 Times 10^3 N, and 2.0 Times 10^5 NExplanation / Answer
A) density = mass /volume
= 107/(4/3 * 3.14 * 0.521 * 0.521 * 0.521)
= 181 kg/m3
=> option (B) is correct .
B) Force = pressure * area
Here, pressure = 1025 * 9.8 * 9400
= 94423000 N/m
=> Force = 94423000 * 3.14 * 0.44 * 0.44
= 5.74 * 107 N
=> option (A) is correct .
C) a) when submarine is submerged = 20000 * 10 - (1000 * 2.564 * 10)
= 1.7 * 105 N
b) when submarine is out of water = 20000 * 10 = 2 * 105 N
=> option (B) is correct .
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