The core of a star must be at temperature of degrees celsius for hydrogen fusion to take place. 10,000 100,000 1,000,000 10,000,000 100,000,000

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •