Which of the following is a difference between medium-mass stars and massive stars?
A) Unlike medium-mass stars, massive stars can get hot enough to ignite carbon fusion.
B) Unlike medium-mass stars, massive stars consume the hydrogen in their cores.
C) Unlike medium-mass stars, massive stars ignite hydrogen shells.
D) Unlike medium-mass stars, massive stars can become giants or supergiants.
A
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What did the International Astronomical Union classify Pluto as in 2006?
a. asteroid b. comet c. planet d. dwarf planet e. meteor
An eclipsing binary has been analyzed and it has been determined that the ratio of the mass of star A to the mass of star B is 6 and the total mass of the two stars is 26 solar masses. What are the masses of star A and star B?
a. Star A has a mass of 1 solar mass and star B has a mass of 6 solar masses. b. Star A has a mass of 20 solar mass and star B has a mass of 6 solar masses. c. Star A has a mass of 31.2 solar mass and star B has a mass of 5.2 solar masses. d. Star A has a mass of 22.3 solar mass and star B has a mass of 3.7 solar masses. e. The masses of star A and star B cannot be determined from the information given.
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. (a) Calculate the linear speed of the center of the sphere when it reaches the bottom of the incline
(b) Determine the angular speed of the sphere about its center at the bottom of the incline. (c) Through what angle (in radians) does this sphere turn as it rolls down the incline? (d) Does the linear speed in (a) depend on the radius or mass of the sphere? Does the angular speed in (b) depend on the radius or mass of the sphere?
An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror. How far is the object from the mirror?
A) 124 cm B) 47.6 cm C) 18.2 cm D) 12.0 cm