Physics, 10.05.2021 19:40, princessbri02
19. If you are watching a moving train, what would happen to the pitch of the whistle at a crossing
as the locomotive approaches and then passes by the crossing?
a. The pitch would remain the same.
b. The pitch would increase suddenly as the train passed.
C. The pitch would decrease and then increase again.
d. The pitch would decrease suddenly as the train passed.
Answers: 3
Physics, 21.06.2019 22:50, Bt758
Two horizontal plates with infinite length and width are separated by a distance h in the z direction. the bottom plate is moving at a velocity u. the incompressible fluid trapped between the plates is moving in the positive x-direction with the bottom plate. align gravity with positive z. assume that the flow is fully-developed and laminar. if the systems operates at steady state and the pressure gradient in x-direction can be ignored, do the following: 1. sketch your system 2. identify the coordinate system to be used. 3. show your coordinates and origin point on the sketch. list all your assumptions. 5. apply the continuity equation to your system. nts of navier stokes equations of choice to your system 7. solve the resulting differential equation to obtain the velocity profile within the system make sure to list your boundary conditions. check units of velocity 8. describe the velocity profile you obtain using engineering terminology. sketch that on the same sketch you provided in (1). 9. obtain the equation that describes the volumetric flow rate in the system. check the units.
Answers: 2
Physics, 22.06.2019 11:00, Arielledt10
1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?
Answers: 1
19. If you are watching a moving train, what would happen to the pitch of the whistle at a crossing...
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