What happens to the core of a star if gravity is strong enough to overcome neutron degeneracy pressure?
A) The core contracts and becomes a white dwarf.
B) The core contracts and becomes a ball of neutrons.
C) The core contracts and becomes a black hole.
D) The star explodes violently, leaving nothing behind.
E) Gravity is not able to overcome neutron degeneracy pressure.
C) The core contracts and becomes a black hole.
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Which of the following is true during the equinoxes?
A. The Sun is on the ecliptic. B. The Sun rises due east and sets due west. C. The Sun is on the Celestial Equator. D. All of these choices are correct.
A 10-m uniform beam weighing 100 N is supported by two vertical ropes at its ends. If a 400-N person sits at a point 2.0 m from the left end of the beam, what is the tension in each rope?
What will be an ideal response?
When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) visible and ultraviolet light from the companion star D) bright x-ray emission that varies on a time scale of a few hours
When Lillian hangs from a pair of gym rings, the upward support forces by the rings will always
A) each be half her weight. B) each be equal to her weight. C) add up to equal her weight. D) add up to more than her weight.