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bella122805
30.01.2020 •
Physics
Aresearch submarine has a 10-cm-diameter window that is 8.4 cm thick. the manufacturer says the window can withstand forces up to 1.2×106 n . what is the submarine's maximum safe depth in salt water?
the pressure inside the submarine is maintained at 1.0 atm .
express your answer using two significant figures.
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Ответ:
15 km
Explanation:
The maximum pressure that the submarine can withheld would be equal to the maximum pressure that the window can withstand.
The maximum pressure that window can sustain is given by:
Force = 1.2×10⁶ N
Area of the window =![\pi r^{2}= 7.85\times 10^{-5} m^2](/tpl/images/0487/6726/0d9f2.png)
∵radius = (0.1 m)/2 = 0.05 m
⇒P = 1.2×10⁶ N ÷ 7.85 ×10⁻³ m² = 1.52 ×10⁸ N/m²
The pressure of the salt water at depth h is given by
P = ρ g h
where, ρ = 1027 kg/m³ is the density of the salt water, g is the acceleration due to gravity and h is the depth.
⇒1.52×10⁸ Pa = (1027 kg/m³)(9.8 m/s²)(h)
⇒ h ≈ 15 km
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