What conditions, common to most stars including our sun, appear to be necessary in order for fusion reactions to take place?

What is my displacement if i walked 200 meters west then turned around and walked 150 meters east

What enables a fish to float up and down in the water

Which is the best example of refraction

The earth has a mass ME = 5.98 · 1024 kg and the moon has a mass MM = 7.36 · 1022 kg. The distance from the center of the earth to the center of the moon is r = 3.82 · 105 km. What is the gravitational force between the earth and moon?

Which pair of countries are both part of the crib Caribbean cultural regions in North America

Is cell using oxygen to break down sugar a physical or chemical change

Which is a branch of Earth science? physics ecology chemistry geology

A 6,600 kg train car moving at + 2.0 m/s bumps into and locks together with one of mass 5,400 kg moving at - 3.0 m/s. What is their final velocity? A.) - 1.0 m/s B.) + 2.5 m/s C.) - 0.25 m/s D.) + 0.50 m/s

Why does matter absorb sound energy?

What is the speed of a wave if the wave length is 100 m and the period is 20 s? A. 80 m/s B. 120 m/s C. 2,000 m/s D. 5 m/s