Plzzz what forms a dune and a sandbar? select one: a. a sandbar is formed by wind. a sand dune is formed by water. b. a sandbar is formed by water. a sand dune is formed by wind. c. both are formed by wind. d. both are formed by water.

How many times did thomas edison mess up the light bulb

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.