Which of the following lists the stages of life for a low-mass star in the correct order?
A) protostar, main-sequence star, red giant, planetary nebula, white dwarf
B) protostar, main-sequence star, red giant, supernova, neutron star
C) protostar, main-sequence star, planetary nebula, red giant
D) main-sequence star, white dwarf, red giant, planetary nebula, protostar
A
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Spheres are an essential part of Kepler's three fundamental rules of planetary motion
a. True b. False Indicate whether the statement is true or false
Graphical Interpretation of Work: The resultant force on an object over a 0.50-s time interval is plotted in the graph in the figure. How much work did this force do on the object during the 0.50-s interval?
A. -25 J B. 50 J C. 22 J D. 12.5 J E. 0 J
Weight and g: Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius r, what is the radius of planet B?
A. r/
B. r
C. r
D. 4r
E. 2r
A stretch of land is 12.5 km long on a map
(a) What would be its length to an observer moving by, parallel to the stretch, at 0.95c? (b) Which length is the proper length? (c) How fast must the observer move for the land to appear 6.50 km long?