Solve Fluid Problems on Titan and Underwater Colony | AP Physics Worksheet

[nickr917]

Hi, I am having some trouble with a couple problems from an AP Physics worksheet. I don't really think that they are actually that hard overall but I'm justhaving a hard time tryng to figure out where to start. Here they are:

A 90,000 kg structure is built on stilts on the surface of Saturns moon, Titan. The structure is 20 m deep, 10 m long, and 10 m wide. Each stilt is attached to a scale that is bolted to the ground. If the air beneath the structure is at rest, how fast must the wind blow over the top of the structure for all the scales to be 0N? (Titan Data: Atmospheric density: 5.38 kg/m3 Gravity: 1.37 N/kg)

I tried to work the problem out by starting with Bernoulli's equation but then I couldn't get anything to work after that. Here is the other problem:

An underwater colony is created 180 m below the surface of a freshwater lake. The colony is a large dome presurized with air to 1.1 atm. One of the residents builds a 20 m x 10 m x 2 m swimming pool. To fill the pool, the resident opens a valve connected to a 0.5 m diameter pipe connected to outside the dome. How long will it take to fill the pool?

Again, I began with Bernoulli's equation but then I can't figure out that rate at which the pool is being filled.

Any help will be appreciated, I just need to be steered in the right direction. Thanks

 

[nickr917]

Guess I put this in the wrong section to begin with. Anyone here able to provide any help. Anything would be much appreciated.

 

[nickr917]

Could really use some help, this is due tomorrow!