Explain what each variable in the Bernoulli Equations stands for and give its units.

• Starting with Bernoulli’s Equation, explain how to derive Bernoulli’s Principle

• Some chimney pipes have a T-shape, with a crosspiece on top that helps draw up gases

whenever there is even a slight breeze. Explain how this works in terms of Bernoulli’s principle.

• Is there a limit to the height to which an entrainment device can raise a fluid? Explain your

answer.

• Why is it preferable for airplanes to take off into the wind rather than with the wind?

• Roofs are sometimes pushed off vertically during a tropical cyclone, and buildings sometimes

explode outward when hit by a tornado. Use Bernoulli’s principle to explain these phenomena.

• It is dangerous to stand close to railroad tracks when a rapidly moving commuter train passes.

Explain why atmospheric pressure would push you toward the moving train.

• Water pressure inside a hose nozzle can be less than atmospheric pressure due to the

Bernoulli effect. Explain in terms of energy how the water can emerge from the nozzle against

the opposing atmospheric pressure.

• David rolled down the window on his car while driving on the freeway. An empty plastic bag on

the floor promptly flew out the window. Explain why.

• Based on Bernoulli’s equation, what are three forms of energy in a fluid? (Note that these

forms are conservative, unlike heat transfer and other dissipative forms not included in

Bernoulli’s equation.)

Problem Set 9 – Bernoulli’s Equation I