When the only force is affecting an object is gravity that object is in

Why hydrogen atom does not emit X-rays? a) it has only one electron b) it has narrow energy levels c) it has far apart energy levels d) it is the lightest patricle.

A cat walks 15 m north and then 12 m south. What distance did the cat walk? O A. 27 m north O B. 3 m O c. 27 m O D. 3 m north

What is the ratio of escape speed from earth to circular orbital speed? ignore air resistance.

Seesaw is an example of what knid of simple machines

To hear a train approaching from far away, why is it more convenient to put the ear to the track?

Does the sun fuse hydrogen into helium or vice versa?

Is it possible to put a distance versus time graph to be universal go mine

On very dry days, when you use a comb or a brush, your hair sometimes stands on the end and maybe even sticks to the comb or brush. Explain why this happens in terms of electric charge.

A large balloon is initially filled to a volume of 1.96 l at 318.44 k and a pressure of 2.89 atm. what volume of gas will the balloon contain at 1.77 atm and 336.33 k?

How to calculate kinetic energy? (physics/physical science)