An instrument is recorded; the resulting pressure vs. time graph is shown below. You may take 340 m s for the speed of sound in air. If this instrument was a flute (open on both ends), determine the length of the air column that produced this tone. Note: The length of the air column may not be the same as the length of the flute – it depends on the number of keys pressed down! Start with a standing wave diagram and solve from there; no memorized equations, for full credit!
If this instrument was an organ pipe (closed on the left end), determine its minimum possible length. (Start with a diagram again.)

Draw the two standing wave diagrams from the flute and organ pipe, this time one above the other, scaled properly relative to each other. The actual value of the scale isn’t important, but they should be the correct dimensions relative to each other.

What’s happening to the particles at the left ends of each? What’s happening to the air pressure at the left ends of each? Explain why this is the case, in terms of interference and reflection.

Bob camina 200 m sur, luego trota 400 m suroeste, luego camina 200 m en una dirección 30? norte del este. a. dibuje una gráfica de los movimientos de bob. use una regla y transportador. b. use método gráfico y analíitico para hallar el desplazamiento total que bob recorrió. (magnitud y dirección) c. compare los resultados obtenidos por el método gráfico y analítico. (por ciento de diferencia).

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.

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.