What is the frequency of I’ve light that has energy of 5.2x10^8J

Which surface feature of the moon is characterized by mountainous areas? terrae craters maria regolith

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is