Question
Question: An electrical short cuts off all power to a submersible when 30 m below the surface of ocean. The cr...
An electrical short cuts off all power to a submersible when 30 m below the surface of ocean. The crew must push out a hatch of area 0.75 m2 and weight 300 N on the bottom to escape. If the pressure inside is 1 atom. What downward force it must exert on the hatch to open it?
A
1.53 × 105N
B
2.03 × 105 N
C
2.28 × 105 N
D
3.03 × 105 Pa
Answer
2.28 × 105 N
Explanation
Solution
DP = 30 × 103 × 10 = 3 × 105 Pa.
F = 3 × .75 × 105 + 300 N = 2.28 × 105 N