4. how much time would it take for an airplane to reach its destination if it traveled at an average speed of
780 kilometers/hour for a distance of 4,700 kilometers? what is the airplane's speed in miles/hour?
hint: show how you convert kilometers into miles for your calculation (1 mile = 1.6 km)
looking for which variable:
solution

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.