Liquid ammonia at −20°c is flowing through a 18-m-long section of a 5-mm-diameter copper tube at a rate of 0.09 kg/s. determine the pressure drop, the head loss, and the pumping power required to overcome the frictional losses in the tube. the density and dynamic viscosity of liquid ammonia at –20°c are ρ = 665.1 kg/m3 and μ = 2.361 × 10-4 kg/m·s. the roughness of copper tubing is 1.5 × 10-6 m. the pressure drop is kpa. the head loss is m. the pumping power required to overcome the frictional losses is kw.

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

option number c is the right answer.