How do we usually hear things? sound waves are made of that pushes together a. energy, air particles b. electromagnetic waves, parts of our ear

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air