When a mixture of aluminum powder and iron(iii) oxide is ignited, it produces molten iron and aluminum oxide. in an experiment, 5.40 g aluminum was mixed with 18.50 g iron(iii) oxide. at the end of the reaction, the mixture contained 11.17 g iron, 10.20 g aluminum oxide, and an undetermined amount of unreacted iron(iii) oxide. no aluminum was left. what is the mass of the unreacted iron(iii) oxide?

When you turn on a battery-operated device, an electrical circuit is

You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” the soy milk is most likely a

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.