The escape velocity of an object depends on I. the mass of that object. II. the mass of the object trying to escape. III. the distance from the center of the object and the escaping object. IV. the speed of light
a. I, II, III, & IV
b. I & II
c. I & III
d. I, II, & IV
e. I, III, & IV
c
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The Tully-Fisher relation uses the ________ of the spiral to find its luminosity
Fill in the blank(s) with correct word
Which of the following is NOT a method used by astronomers to detect and study exoplanets?
A. direct imaging B. gravitational lensing C. rotational mapping D. doppler shift E. transit detection
A planetary nebula is an example of a star no longer in hydrostatic equilibrium
a. True b. False Indicate whether the statement is true or false
The rate of heat flow by conduction through a slab is Pcond. If the slab thickness is doubled, its cross-sectional area is halved, and the temperature difference across it is doubled, then the rate of heat flow becomes:
A. 2Pcond B. Pcond/2 C. Pcond D. Pcond/8 E. 8Pcond