What is an initial condition? How many initial conditions do we need to specify for a two-dimensional heat conduction problem?
What will be an ideal response?
The mathematical expression for the temperature distribution of the medium initially is called the initial condition. We need only one initial condition for a heat conduction problem regardless of the dimension since the conduction equation is first order in time (it involves the first derivative of temperature with respect to time). Therefore, we need only 1 initial condition for a two-dimensional problem.
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Which of the following are true statements about the molar volume of the mixture?
The molar volume of a binary mixture can be represented by the following function at a given temperature and pressure: V = 22.15 + 24.10x1 + 3.83x12. Here, V has units of m3/mol. A. The molar volume of pure component (2) is equal to 50.08 m3/mol. B. The molar volume of pure component (1) is equal to 24.10 m3/mol. C. The molar volume of the equimolar mixture is 35.16 m3/mol. D. The reference molar volume is set equal to zero for the pure components. E. None of the above are true.
To prepare a 1000 p.p.m. solution of E.P.A. registered Quaternary ammonium compounds, using a 15% active
What will be an ideal response?
Select the lifting techniques that will reduce the possibility of injury from lifting a heavy item. (You may select more than one.)
A) Keep the load close to your body. B) Use your back muscles to do the work. C) Keep your back as straight as possible. D) Use your leg muscles to do the work. E) Lift slowly. F) Lift quickly. G) Keep your knees as straight as possible.
Answer the following statement(s) true (T) or false (F)
1. Engineers use conventional engineering symbols as a means to convey information and to effectively communicate to other engineers. 2. Rotated section views may be used when the object has a uniform cross section with a shape that is difficult to visualize. In such cases, the cross section is rotated by 90° and is shown in the plane of view. 3. It is not necessary for all engineering drawings to contain an information box with the following items: name of the person who prepared the drawing, title of the drawing, date, scale, sheet number, and drawing number. 4. The type of drawings that is common to civil engineering include land or boundary, topographic, construction, connection and reinforcement details, and route survey drawings.