5A. A teacher is demonstrating Newton's Third Law of Motion using a string, straw, and balloon. She blows up the balloon with air and attaches the balloon to the straw. Then, she lets go. The two objects that we will focus on are the air and the balloon. If this is the case, then what is the action and reaction force? The action force is .

The reaction force is
5B. How can you relate the balloon moving forward to Newton's Second Law of Motion?
6A. A student throws a ball against a wall. What are the action and reaction forces in this example?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.