19. Fluid Mechanics

Which of the following best describes the relationship between pressure, force, and area?

Which of the following statements is true regarding atmospheric pressure?

Which of the following devices is specifically designed to detect and measure $pressure$?

Which of the following statements about $\mathrm{psi}$ (pounds per square inch) is false?

(II) A wind blowing over the flat roof of a house causes the roof to lift off the house. If the house is 6.2 m x 12.4 m in size, estimate the weight of the roof. Assume the roof is not nailed down.

Which of the following is true about negative pressure systems?

Which of the following sets of variables are typically used to describe the pressure exerted by a gas in a piston system?

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?

A tall cylindrical beaker 10 cm in radius is placed on a picnic table outside. You pour 5 L of an 8,000 kg/m³ liquid and 10 L of a 6,000 kg/m³ liquid into. Calculate the total pressure at the bottom of the beaker. (Use g=10 m/s².)

A wooden cube, 1 m on all sides and having density 800 kg/m³ , 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/s².)