The white-bellied hedgehog is the most common of all the species of hedgehogs found as pets in the United States
Indicate whether the statement is true or false
True
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True position is the theoretically exact location ____ of a feature.
A. of the datum B. of the axis C. of the center plane D. both b and c E. all of the above
The thermal conductivity of a material can be determined in the following manner. Saturated steam 2.41 ? 105 N/m2 is condensed at the rate of 0.68 kg/h inside a hollow iron sphere that is 1.3 cm thick and has an internal diameter of 51 cm. The sphere is coated with the material whose thermal conductivity is to be evaluated. The thickness of the material to be tested is 10 cm and there are two thermocouples embedded in it, one 1.3 cm from the surface of the iron sphere and one 1.3 cm from the exterior surface of the system. If the inner thermocouple indicates a temperature of 110°C and the outer themocouple a temperature of 57°C, calculate (a) the thermal conductivity of the material surrounding the metal sphere, (b) the temperatures at the interior and exterior surfaces of the test
material, and (c) the overall heat transfer coefficient based on the interior surface of the iron sphere, assuming the thermal resistances at the surfaces, as well as the interface between the two spherical shells, are negligible.
GIVEN
FIND
ASSUMPTIONS
- Thermal resistance at the surface is negligible
- Thermal resistance at the interface is negligible
- The system has reached steady-state
- The thermal conductivities are constant
- One dimensional conduction radially
SKETCH
The plugging switch may be driven by gears, by a chain drive, or a ____ coupling.
a. welded half b. direct rigid c. welded current d. direct flexible
Blue box subsidies:
a. Are minimally trade distorting. b. Involve production controls. c. Are economic distorting. d. Do not depress the world market price. e. a and b above.