If steam is used as a cleaning agent for removing caffeine attached to the sides of 2-cmdiameter tubes in a coffee processing plant, estimate the time to remove 1 mm of caffeine from the inside of the tubes if steam at 120ºC, 1 atm pressure, is forced through the tubes at 10 m/s. Assume the diffusivity of caffeine into steam is 6 x 10^-6 m^2/s and a density of 800 kg/m^3 for caffeine.
What will be an ideal response?
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The formation process for supermassive black holes is linked with the formation of galactic ____
a. disks b. clusters c. central bulges d. coronae e. halos
Objects that subtend a larger angle in the eye
A. Are perceived to be smaller B. Are perceived to be larger C. The subtended angle has no effect on perception D. Are farther way
Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Are Velma and Mort in relative motion?
A) No, because they both have the same speed. B) No, because they both have the same velocity. C) No, because neither Mort nor Velma is accelerated. D) Yes, because they have different velocities. E) Yes, because they have different speeds.
Uranus and Neptune do not contain liquid metallic hydrogen because they
a. are not massive enough. b. do not contain enough hydrogen. c. rotate too slowly. d. are too far from the sun. e. have magnetic fields that are much too weak.