What are causes of diffusional mass transfer?
What will be an ideal response?
Diffusional mass transfer occurs due to a pressure difference or a pressure gradient, due to a concentration or density difference or gradient, due to a temperature difference or gradient, due to body forces on the mixture components, due to forced or free convection currents, due to turbulent flow, or due to phase change phenomena.
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Fluid Flow: Water flowing through a cylindrical pipe suddenly comes to a section of pipe where the diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was 32 m/s, what is its speed in this smaller section if the water behaves like an ideal incompressible fluid?
A. 43 m/s B. 37 m/s C. 28 m/s D. 24 m/s
Energy and Momentum: Two simple pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are small solid steel spheres. The first bob is drawn back to make a 35° angle with the vertical, while the other one is left hanging at rest. If the first bob has a mass of 0.25 kg and the second has a mass of 0.54 kg, how high will the second bob rise above its initial position when struck elastically by the first bob after it is released?
A. 3.3 cm B. 2.7 cm C. 3.9 cm D. 4.4 cm
An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the
A) -x direction. B) +x direction. C) +y direction. D) -z direction. E) +z direction.
An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator