How long is a wire made from 100 cm3 of copper if its resistance is 4.0 ohms? The resistivity of copper is 1.7 × 10^–5 ?·m
a. 4.9 m
b. 1.7 × 10^2 m
c. 2.6 × 10^2 m
d. 1.5 × 10^3 m
e. 24 m
a
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Consider a black body emitting 0.2 W/m^2 of thermal radiation between zero and 0.01 ?m wavelengths and 1.2 W/m^2 above 0.01 ?m. What is the total radiation emitted per unit area? What is emitted at exactly 0.01 ?m?
What will be an ideal response?
A second magnitude star in Ursa Major is brighter than a fourth magnitude star in Orion
a. True b. False Indicate whether the statement is true or false
In addition to the conditions required for any solar eclipse, what must also be true in order for you to observe a total solar eclipse?
A) Earth must be near aphelion in its orbit of the Sun. B) The Moon's umbra must touch the area where you are located. C) Earth must lie completely within the Moon's umbra. D) Earth must lie completely within the Moon's penumbra. E) The Moon's penumbra must touch the area where you are located.
During loading in a stress-strain test of a material, we observe that the plot is not linear and has no discontinuities. We can assume that:
(a) The material is nonlinear elastic. (b) The material is anelastic. (c) There is elastic and plastic strain. (d) None of the above can be assumed.