Megan is at a swimming pool, and
wants to jump off of a diving board into the water.
She wants to hit the water with a kinetic energy of
1300 J. If Megan has a mass of 55 kg, how high of a
diving board should she jump off of?

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

A90db sound wave strikes an eardrum whose area is 5.0×10^-5m^2. how much energy is absorbed by the eardrum per second

Why did thomson's results from experimenting with cathode rays cause a big change in specific thought about atoms ?