Срочно пожалуйста помогит Water circulates throughout a house in a hot-water system. The water is pumped at a speed of 0.5 m/s through a 4.0 cm diameter pipe in the basement under a pressure of 3 atmospheres. Calculate the pressure in the pipe on the second floor.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

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.