A star on the main sequence has 7 solar masses. The star will evolve into a ____________ and its core will be supported by ______________
a. white dwarf, electron degeneracy pressure b. neutron star, neutron degeneracy pressure
c. black hole, no pressure (i.e., it will not be supported) d. white dwarf, neutron star, or black hole; electron degeneracy, neutron degeneracy, and no pressure, respectively.
a
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Both sound and light can travel in
A) a vacuum. B) water. C) both of these D) none of the above
When a quark emits or absorbs a gluon, the quark changes
A) its mass. B) its charge. C) its color. D) into an antiquark. E) into a fermion.
Two ships set sail from the same port. Ship A sails a distance of 35.0 kilometers in a direction 30.0° north of east, and drops anchor. Ship B sails due south. When ship B is 30.0 km from the port, how far apart are the ships?
a. 46.1 km b. 56.3 km c. 65.0 km d. 75.9 km
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
a. 16 m/s b. 45 m/s c. 23 m/s d. 20 m/s e. 36 m/s