Can someone please help me with this.. Q. A sphere of mass 10.0 was charged negatively. It was held, floating 2.5cm above an object carrying a charge of -1.4 ×10^-7C. what charge would be carried by the sphere.

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

Which sound characteristic is not affected by the relative motion of an object

Need this now! do pilots live long