in the evolution of extremely large stars, they begin as supergiants or supernovas, if the star nucleus is large enough it will continue to contract and form neutron stars, and finally, if the contractions continue, everything around the neutron star and the neutron star itself will be pulled into what is called a
a. white dwarf
b. nebula
c. giant
d. black hole

select the best answer from the choices provided

a
b
c
d

What if? if the temperature near the cliff suddenly falls to 0°c, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to hear the sound of the splash 2.90 s after kicking the rock?

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

Two thin 80.0- cm rods are oriented at right angles to each other. each rod has one end at the origin of the coordinates, and one of them extends along the x- axis while the other extends along the yaxis. the rod along the x- axis carries a charge of - 15.0 μ c distributed uniformly along its length, and the other rod carries 15.0 μ c uniformly over its length. find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e