# Intro to Pressure - Video Tutorials & Practice Problems

## Pressure and Atmospheric Pressure

A large warehouse is 100 m wide, 100 m deep, 10 m high:

a) What is the total weight of the air inside the warehouse?

b) How much pressure does the weight of the air apply on the floor?

^{4}N;

(b) 1200 Pa

^{5}N;

(b) 120 Pa

^{5}N;

(b) 1200 Pa

^{6}N;

(b) 120 Pa

## Pressure In Air and In Liquids

## Calculating Pressure in Liquids

The deepest known point on Earth is called the Mariana Trench, at ~11,000 m (~36,000 ft). If the surface area of the average human ear is 20 cm2, how much average force would be exerted on your ear at that depth?

2.22×10^{5} N

2.22×10^{7} N

1.11×10^{8} N

2.22×10^{9} N

A tall cylindrical beaker 10 cm in radius is placed on a picnic table outside. You pour 5 L of an 8,000 kg/m^{3} liquid and 10 L of a 6,000 kg/m^{3} liquid into. Calculate the total pressure at the bottom of the beaker. (Use *g*=10 m/s^{2}.)

3.20×10^{4}

3.52×10^{4}

1.33×10^{5}

1.36×10^{5}

A wooden cube, 1 m on all sides and having density 800 kg/m^{3} , is held under water in a large container by a string, as shown below. The top of the cube is exactly 2 m below the water line. Calculate the difference between the force applied by water to the top and to the bottom faces of the cube (Hint:calculate the two forces, then subtract. Use *g*=10 m/s^{2}.)

_{bot}− F

_{top}= 800 N

_{bot}− F

_{top}= 1000 N

_{bot}− F

_{top}= 8,000 N

_{bot}− F

_{top}= 10,000 N

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