PLEASE HELP, WILL PICK BRAINLIEST What is the gravitational potential energy of a diver who weighs 600 N standing on a platform that is 8 m off the ground?

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

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

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.