When powdered iron is left exposed to the air, it rusts. explain why the mass of the rust is greater than the mass of the powdered iron?

You and your friend are stranded on a raft of mass 1000 kg which is not moving, you can neglect friction between the boat and the water. After a strong argument, your friend throws the paddle of mass 40 kg overboard at a speed of 3 m/s.

8,000,000 kg of water are at the verge of dropping over Niagara Falls to the rocks 50.0 meters below. What is the change in gravitational potential energy as the water splashes on the rocks below?

It takes 300 newtons of force and a distance of 20 meters for a moving car to come to stop

Select the correct answer from each drop-down menu. Brass and bronze are both A.___ of copper because copper is the B.___ component in brass and bronze. A. alloys composites variations void B. main most dense most expensive only

What force keeps an object moving in a circle

How does the sun's heat affect the humidity of a place

Which "spheres" are interacting when water evaporates from plants

Which of Einstein's theories was most important?

Which of these statements best describes a similarity between the two galaxies? Both have elongated centers. Both have centers shaped like bars. Both change their shape from time to time. Both are held together by gravitational forces.

The part of the earth system that includes earths solid, rocky, outer layer is the