Oil flows through the Alaska pipe line on a clear, sunny day. The flow in the pipe can best be classified as:
(A) Uniform
(B) Developed
(C) Two-dimensional
(D) Cylindrical
(B) Developed
The flow is definitely not 2D nor is it cylindrical (this is not a type of flow, only a certain coordinate system), so that leaves either (A) or (B). The flow would be at most one-dimensional, u = u(r). It is certainly a developed flow, i.e., the velocity does not depend on the flow direction, u ? u(x).
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In an electrochemical cell, there is a tin electrode in a molar solution of Sn2+ ions and an iron electrode in a molar solution of Fe2+ ions.
(a) What reactions occur at the two electrodes? (b) What voltage is developed in the cell? (c) What is the Gibbs free energy change per mole of ions involved in the reaction?
Syrup having density of 1000 kg/m^3 and viscosity of 1250 cP flows through a deep trough at 10 m/s. Determine the Reynolds number at a distance 2 m downstream from the entrance. Is the flow in the boundary layer laminar or turbulent?
What will be an ideal response?
Momentum: Three objects are moving along a straight line as shown in the figure. Taking the positive direction to be to the right, what is the total momentum of this system?
A. +106 kg ? m/s B. -106 kg ? m/s C. +14.0 kg ? m/s D. -14.0 kg ? m/s E. 0.00 kg ? m/s
Three 6.0-? resistors are connected in parallel. What is their equivalent resistance?
a. 0.083 ? b. 3.0 ? c. 0.50 ? d. 2.0 ? e. 6.0 ?