By Welty, Rorrer, Foster

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**Extra resources for Fundamentals of Momentum, Heat and Mass Transfer**

**Example text**

Water temp. = 150°F 7 in. Kerosene 2 in. 2 and inverting a tube full of this material as shown in the ﬁgure, what is the value of h if the vapor pressure of the liquid is 3 psia? 3 in.? 12 What is the pressure pA in the ﬁgure? 8. 15 A differential manometer is used to measure the pressure change caused by a ﬂow constriction in a piping system as shown. Determine the pressure difference between points A and B in psi. Which section has the higher pressure? H2O pA Open Oil 10' B 4 in. A 15' 10 in.

The mixture in the tank is kept uniform by stirring. Brine is removed from the tank via an outlet pipe at a rate of 10 kg/min. Find the amount of salt in the tank at any time t, and the elapsed time when the amount of salt in the tank is 200 kg. 4 A mixing process. 3GCH04 11/15/2013 16:21:55 Page 38 38 ▶ Chapter 4 Conservation of Mass: Control-Volume Approach We ﬁrst apply equation (4-1) to express the total amount of brine in the tank as a function of time. For the control volume shown ZZ r v ?

27 The dam shown below is 100 m wide. Determine the magnitude and location of the force on the inclined surface. 28 The ﬂoat in a toilet tank is a sphere of radius R and is made of a material with density r. An upward buoyant force F is required to shut the ballcock valve. The density of water is designated rw . Develop an expression for x, the fraction of the ﬂoat submerged, in terms of R, r, F, g, and rw . 29 A cubical piece of wood with an edge L in length ﬂoats in the water. 90. What moment M is required to hold the cube in the position shown?

### Fundamentals of Momentum, Heat and Mass Transfer by Welty, Rorrer, Foster

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