A 3 m diameter by 2 m high tank contains sulfuric acid at 100ºC. If the sides are sudden heated to 150ºC, determine the boundary layer thickness of the acid as it moves up the sides of the tank by natural convection. The properties of sulfuric acid are: ?p = 5.0 x 10^-3 K^-1, ? = 1.2 x 10^-6 m^2/s, and Pr = 1.5.
What will be an ideal response?
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For a plane to be able to fly clockwise in a horizontal circle as seen from above, in addition to exerting a force downwards on the air
a. it must be increasing its speed. b. it must exert a force on the air that is directed to the plane's left side. c. it must exert a force on the air that is directed to the plane's right side. d. it does not need to exert a force: it must only move the wing flaps out. e. it only needs to deflect the air without exerting any additional force on the air.
A centrifuge rotates at 100 rev/s (i.e., 628 rad/s). If the test tube places the suspension at 10 cm from the axis of rotation, by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity?
a. 3.2 × 10^3 c. 800 b. 64 d. 4.0 × 10^4
Two converging lenses, the first with focal length 40 cm and the second with focal length 331/3 cm, are separated by 10.0 cm. An object of height 6.0 cm is placed 20.0 cm in front of the first lens. Where is the final image formed?
A. 10 cm before the first lens B. 50 cm before the first lens C. 50 cm after the second lens D. 100 cm after the second lens E. 331/3cm after the second lens
A uniform electric field, with a magnitude of 650 N/C, is directed parallel to the positive x-axis. If the potential at x = 3.0 m is 1 700 V, what is the potential at x = 1.0 m?
a. 3 300 V b. 4 050 V c. 3 000 V d. 400 V e. 1 500 V