Two boxes are at rest on a smooth, horizontal surface. the boxes are in contact with one another. if box 1 is pushed with a force of magnitude f = 12.2 n , the contact force between the boxes is 8.90 n ; if, instead, box 2 is pushed with the force f, the contact force is 3.30 n . in either case, the boxes move together with an acceleration of 1.50 m/s2. what is the mass of box 1? what is the mass of box 2?

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

Which changes of state do the labels represent? a: b: c:

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.