# Where can I learn all of this? Fluid Physics

1. Dec 10, 2012

### cameronjrhea

I've been attempting my Physics homework and realize I have no idea how to do any of the problems. Instead of asking each of them, I figured I'd ask if anyone knew where I could find a general lesson plan for this section. Here are some of the problems. All help is appreciated :).

1) A research submarine has a 29 cm diameter window 10.0 cm thick. The manufacturer says the window can withstand forces up to 1.0 106 N. What is the submarine's maximum safe depth? Assume that the pressure inside the submarine is maintained at 1.0 atm and that the density of seawater is 1030 kg/m3.

4) Styrofoam has a density of 300 kg/m3. What is the maximum mass that can hang without sinking from a 54 cm diameter Styrofoam sphere in water? Assume the volume of the mass is negligible compared to that of the sphere.

5) Water flowing through a 1.8 cm diameter pipe can fill a 320 L bathtub in 4.2 minutes. What is the speed of the water in the pipe?

7) A friend asks you how much pressure is in your car tires. You know that the tire manufacturer recommends 30 psi, but it's been a while since you've checked. You can't find a tire gauge in the car, but you do find the owner's manual and a ruler. Fortunately, you've just finished taking physics, so you tell your friend, "I don't know, but I can figure it out." From the owner's manual you find that the car's mass is 1550 kg. It seems reasonable to assume that each tire supports one-fourth of the weight. With the ruler you find that the tires are 10 cm wide and the flattened segment of the tire in contact with the road is 14 cm long.