ВA chair-lift is designed to transport 1000 skiers per hour from the base Ato the summit B. The average mass of a skier is 70 kg and the averagespeed of the lift is 75 m/min. Determine (a) the average power required,(b) the required capacity of the motor if the mechanical efficiency is 85percent and if a 300 percent overload is to be allowed.300 mА750 m

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Answered: A chair-lift is designed to transport…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A chair lift is to be installed from the surface down to a depth of 150 m. The inclination is 17 degrees to the horizontal. An operating velocity is to be used, and the system will be required to transport 300 persons per hour. Assuming the worst-case scenario, namely that no persons travel down while the system has a full load traveling up, determine: 1. the spacing of thr chairs 2. the traveling time per person 3. the output power of the motor required to drive the system Perfomance criteria: A force criteria: A force of 2 kN per 100 m of the length of the loaded part of the system is required to overcome friction. Mass per person: 70 kg Overall mechanical efficiency: 85%
What power is required (at the wheels) for a 1400 kg automobile to climb a 4% grade at a constant speed 30 m/s while it is opposed by drag and rolling resistance forces totaling 500 N?
What is the effect of weight on maximum endurance and maximum range? What happens to maximum endurance and maximum range airspeed when weight is increased?
The motion of a steel ball in a hemispherical bowl of radius h shown in fig is to be analyzed. The ball is initially held at the highest location at point A, and then it is released. Obtain relations for the conservation of energy of the ball for the cases of frictionless and actual motions.
Commercially available large wind turbines have blade span diameters as large as 100 m and generate over 3 MW of electric power at peak design conditions. Consider a wind turbine with a 90 m blade span subjected to 25 km/h steady winds. If the combined turbine generator efficiency of the wind turbine is 32 percent, determine(a) The power generated by the turbine.(b) The horizontal force exerted by the wind on the supporting mast of the turbine.Take the density of air to be 1.2 kg/m3and disregard frictional effects.
A submarine can be treated as an ellipsoid with a diameter of 5 m and a length of 25 m. Determine the power required for this submarine to cruise horizontally and steadily at 40 km/h in seawater whose density is 1025 kg/m3. Also determine the power required to tow this submarine in air whose density is 1.30 kg/m3. Assume the flow is turbulent in both cases.
At highway speeds, about half of the power generated by the car’s engine is used to overcome aerodynamic drag, and thus the fuel consumption is nearly proportional to the drag force on a level road. Determine the percentage increase in fuel consumption of a car per unit time when a person who normally drives at 55 mi/h now starts driving at 75 mi/h.
A wheel tractor has a 200 HP engine. Calculate the available rimpull of this tractorif it is operating at an altitude of 1,000 m. above sea level, at an averagetemperature of 25oC, and at an average speed of 12 km/hr. Take rimpull efficiencyas 85%.
A paratrooper and his 7-m-diameter parachute weigh 1200 N. Taking the average air density to be 1.2 kg/m3, determine the terminal velocity of the paratrooper.
A wind turbine generator system having a diameter of 82.5 m produces 1.5 MW at a wind speed of 12 m/s. Determine the diameter of blade necessary to produce 10 MW of power assuming the efficiency is the same for both designs and p = 1.21 kg/m3 for air.
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A wind generator with a 9 m diameter blade span has a cut-in wind speed of 5 m/s. The cut-out wind speed is 2.5 m/s. Determine a) the power generated by the wind turbines? b) the horizontal force exerted by the wind on the supporting post of the wind turbine? The density of air is taken to be 1.225 kg/m3.

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