A toy car is at the top of a ramp. It has 20 J of gravitational potential energy. When it runs down the ramp and reaches the bottom it has zero gravitational potential energy.

Assuming friction and air resistance have no effect, how much kinetic energy does it have at the bottom of the ramp?

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Acombination reaction is when two or more combine to form one product. a decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.

Which subatomic particle has a negative charge