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.

Wind or electric energy force force of friction

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Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction