一个ll AP Physics 2 Resources
Example Questions
Example Question #101 :Fluids
一个tank is completely full of water to the height of. On the side of the tank, at the very bottom a small hole is punctured. With what velocity does water flow though the hole at the bottom of the water tank?
The equation for determining the velocity of fluid through a hole is as follows:
This equation is actually derived from Bernoulli's principle. Theis for velocity, theis the acceleration due to gravity andis the height. We solve for velocity by substituting for the values:
Example Question #22 :Flow Rate
一个syringe has a cross-sectional area ofand the needle attached to the syringe has a cross-sectional area of. The fluid in the syringe is pushed with a speed of, with what velocity does the fluid exit the needle opening?
The correct answer isbecause the cross-sectional area of the syringe istimes larger than the needle opening. Therefore, the velocity will belarger as well.
Example Question #23 :Flow Rate
Pipehas radius, and pipehas radius. The two pipes are connected. In order for the speed of water in pipeto betimes as great as the speed in pipe, what must be?
The continuity equation says that the cross sectional area of the pipe multiplied by velocity must be constant. Letbe the water speed in pipe.
Example Question #24 :Flow Rate
一个fluid is forced through a pipe of changing cross sections as shown. In which section would the velocity of the fluid be a maximum?
一个ll sections have the same velocity
III
I
IV
II
II
Flow rate is equal to the product of cross-sectional area and velocity and must remain constant. Therefore, as the cross-sectional area decreases, the velocity increases.
Certified Tutor
Certified Tutor