Block a, with a mass of 2.0kg, moves along the x axis with a velocity of 5.0m/s in the positive x direction. it su? ers an elastic collision with block b, initially at rest, and the blocks leave the collision along the x axis. if b is much more massive than a, the speed of a after the collision is:

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.