mauvecockroach850Lv1in Mechanical Engineering·3 Oct 2020Develop a mathematical model (differential and algebraic equations) that describes the exit temperature (T) if heat losses to the ambient occur and if the ambient temperature (T,) and the incoming stream's temperature (T) both can vary. The heat losses can be represented by: Qloses = UA, (T – T.) Notes: p and Cp are constants. U the overall heat transfer coefficient is constant. A, is the surface area for heat losses to ambient Ti > Ta (inlet temperature is higher than ambient temperature).
lemonwolf569Lv1in Mechanical Engineering·1 Oct 2020Copper is cubic, and has tetrad rotation axes parallel to the reference axes x1, x2, and x3. Consider the tetrad along x1. Look down this tetrad towards the origin and write down the matrix of direction cosines relating new and old axes for a 90° counterclockwise rotation imposed by this tetrad. What constraints does this symmetry operation place on the second-rank electrical conductivity tensor for copper? Starting from the original reference axes, repeat (a) for the tetrad along x2. Starting from the original reference axes, repeat (a) for the tetrad along x3. Use your results from (a), (b), and (c) to show that the electrical conductivity of single crystals of copper is isotropic.
orchidsalmon65Lv1in Mechanical Engineering·5 Sep 2020A particle of mass M positioned on the top of a semi-circle of radius R has been given the initial velocity Vo, as seen in the figure. (a) Determine the angle at which the particle loses contact with the semi-circle. Neglect motion resistance. The gravity acceleration is g. (b) Determine the initial velocity Vo, for which the particle can leave the semi-circle surface at the initial position.
ceruleanelephant700Lv1in Mechanical Engineering·27 May 2020You have designed a centrifuge system to separate cells from a solution. A mixture of water and cells enters the centrifuge system at a rate 1000 L/h and contains 500 mg cells/L. You can assume that the density is that of water (1 g/cm3). The inlet stream or feed (F), is separated to a cell-free supernatant (S), and a pellet (P) consisting of a solution containing water and cells. The mass fraction of cells in the pellet is 0.5. Using the data in the figure, calculate the mass flow rates mP (g/hr) and mS (g/hr).
whitedonkey880Lv1in Mechanical Engineering·19 May 2020Consider the flow in the Cartesian coordinate system, due to the superposition of a line source of strength Q localized at (0,b) and a line source of the same strength at (0,-b). a) Sketch several streamlines b) Calculate the velocity, the pressure distribution and pressure coefficient along the x axis c) Can you replace the x axis with a solid wall? If the answer is yes or no, explain why.
whitedonkey880Lv1in Mechanical Engineering·20 May 2020Assuming a linear velocity profile, find the boundary layer thickness the wall shear stress, the displacement thickness and the drag for a flat plate with zero pressure gradient and free stream velocity U0. The plate has length L and width b. Do you have flow separation? If the answer is yes or no, explain why.
violetgerbil757Lv1in Mechanical Engineering·16 Apr 2020Water is delivered at 0.040 m3/s into the open tank using a pump and a 120 mm diameter cast iron pipe. If the system losses through the pipe are 6.4 Nm/N, determine the power output of the pump.
whitedonkey880Lv1in Mechanical Engineering·5 Apr 2020finite element analysis can i get some help with Q2
yellowreindeer430Lv1in Mechanical Engineering·30 Mar 2020A 70 kg bungee jumper jump from the top of a 70 m high bridge and able to touch the water below. The bungee cord has a spring constant of 72.5 N/m, where the unstretched position is when s = 0. Using the principle of work and energy, determine the bungee cord's relaxed length, l, for this jump. If the resistance of the air were not present during the jumping, describe what happened to him?
jadezebra622Lv1in Mechanical Engineering·25 Mar 2020you have been hired to design a family-friendly seesaw rom the end of the board when seated. You have selected a child of mass, (seated furthest from the pivot) and an adult of mass, (seated closest to the pivot) to test out your prototype. a. Determine the distance d in meters. b. Determine the magnitude of the force exerted on the pivot point by the see-saw while in use in newtons.