What has to happen for a star to start its life ? 1) Needs enough gravity

2) Needs to suck in everything from the interstellar cloud

3) Needs nuclear fusion to start

4) Needs to exit the T. Tauri phase

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

In the first law of thermodynamics, triangle e=q-w, what does q stand for

(1 point) match the differential equations and their vector valued function solutions. you may wish to multiply at least one solution out fully, to make sure that you know how to do it. you can get the other answers quickly by process of elimination and just multiply out one row element.