what is the maximum velocity of an electron ejected from a charged copper plate with a work function of 7.44 x 10^-19 is illuminated with ultraviolet rays that have a frequency of 1.28 x 10^15

After a car's engine has been running for a while, if you stand near the car's engine you can often feel heat coming from the engine as a result of a. radiation b. convection c. conduction

Abody of weight 60 kg is standing in a lift the lift going upward with a uniform velocity of 4.9 metre per second slows down and stops in two seconds then apparent weight of the body during the slow down process is

If steel is more dense that lake water, why can a boat float