On a bus traveling north at 20.0m/s, a child stands up and walks towards the back of
the bus at 1.3m/s. What is the child's resultant velocity?

What is the frequency of a light wave with a wavelength of 620nm

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point