Lewis symbol equation
The Lewis symbol 
would be characteristic of
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Determine the ratio of the total hemispherical emissivity to the normal emissivity for a nondiffuse surface if the intensity of emission varies as the cosine of the angle measured from the normal.
GIVEN
• A nondiffuse surface
• Intensity of emission varies as the cosine of the angle measured from normal
FIND
• The ratio of the total hemispherical emissivity (?) to the normal emissivity (?n)
SKETCH
Planet Zero has a mass of 5.0 × 10^23 kg and a radius of 2.0 × 10^6 m. A space probe is launched vertically from the surface of Zero with an initial speed of 4.0 km/s. What is the speed of the probe when it is 3.0 × 10^6 m from Zero's center?
a. 3.0 km/s b. 2.2 km/s c. 1.6 km/s d. 3.7 km/s e. 5.9 km/s
The period of an oscillating weight on a spring in an inertial frame of reference is 2.5 s. What would be its speed if it were to move by an observer who measures its period as 3.4 s? (c = 3.00 × 10^8 m/s)
a. 1.5 × l08 m/s b. 2.0 × 10^8 m/s c. 2.8 × l08 m/s d. 6.8 × 10^7 m/s e. 1.3 × 10^8 m/s
One reason the planets near the Sun are composed mainly of rock and iron may be that
A. the Sun is made mostly of iron, so the planets nearest it are formed of iron. B. the Sun's heat made it difficult for ices and gases to condense near it. C. the Sun's gravity sucked in iron and heavy material and the lighter materials floated farther away. D. the Sun's magnetic field attracted all the iron into the region around the Sun.