A rotating uniform cylindrical platform of mass 220 kg and radius 5.5 slows down from 3.8 rev/s to rest in 16s when the driving motor is disconnected. Estimate the power output of the motor required to maintain a steady speed of 3.8rev/s.

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

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

The ph is the a.independent variable b.the dependent variable c.control group