Calculate the work done by a 60 N force pushing a pencil 0.25 m

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.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.