A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at 112°C, you measure that it radiates energy at a rate of 71.3 W
What is the emissivity of the surface of this object? Any heat that enters the sphere from the outside environment is negligible. The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4.
0.810
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Aluminum-lithium alloys were developed for aircraft applications because of their relatively high yield strength and low _________.
Fill in the blank(s) with the appropriate word(s).
A fluid that flows very slowly compared to water has a high ________.
Fill in the blank(s) with the appropriate word(s).
A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
a. 4.6 mm b. 7.1 mm c. 5.3 mm d. 12 mm e. 10 mm
When hydrogen, from Group 1A, unites with chlorine, it forms a(n) ______________ compound
a. ionic b. metallic c. covalent d. organic