Volcanoes change the earth by
a) slowly seeping and flowing over time
b) slowly heating the surface
c) rapidly using up the oxygen
d) keeping mountains from growing

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

Newtons view of arrangement of the universe