Star A has a temperature 1/4 that of star B. Both star A and star B are the same physical size. Which statement below is correct?
A) Star A is redder and dimmer than star B.
B) Star A is bluer and dimmer than star B.
C) Star A is redder and brighter than star B.
D) Star A is bluer and brighter than star B.
E) Star A and star B have the same color, but star A is brighter.
A
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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
The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is decreasing. B. its angular momentum is increasing. C. the gravitational force does no work on the planet. D. all of the above are correct. E. none of the above is correct.
Michael is going to the store 6 miles away. He rides his bike at 12 mph for the first half of the trip, then walks at 4 mph for the remainder
Michael's average speed for the trip to the store is closest to:
1.2 mph 2.4 mph 3.6 mph 4.8 mph 5.10 mph 6.12 mph 7.14 mph 8.exactly halfway between two of the values above 9.impossible to determineTwo uses of ultrasound are navigation by bats and controlling insects
Indicate whether the statement is true or false