Once carbon begins burning in the core of a high-mass star, the outer layers begin to fall inward, driving up the fusion rates and speeding up the star's evolution primarily because: Question 65 options:

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount

What sort of waves exhibit the doppler effect?