A heat engine that draws from a reservoir at a temperature of 600 K and whose heat sink is a room at 300 K has a maximum ideal efficiency of %.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.