. Electric traction and transmission engineering . TRACTIVE EFFORT REQUIRED FOR CAR PROPULSION. 21. Fig. io. Then —- = horizontal centrifugal force, andK mg = vertical gravitational force. An inspection of Fig. io shows that the resultant of theseforces will be perpendicular to the plane of the track whenthat plane makes an angle 0with the horizontal such that 0 = tan-1—• Rg A road section devoid ofcurves is said to have a tan-gent track. 11. Acceleration. — In the foregoing paragraphs onlythe torque to be exerted at the rim of the car wheels foruniform speed was determined. But in railway ope
. Electric traction and transmission engineering . TRACTIVE EFFORT REQUIRED FOR CAR PROPULSION. 21. Fig. io. Then —- = horizontal centrifugal force, andK mg = vertical gravitational force. An inspection of Fig. io shows that the resultant of theseforces will be perpendicular to the plane of the track whenthat plane makes an angle 0with the horizontal such that 0 = tan-1—• Rg A road section devoid ofcurves is said to have a tan-gent track. 11. Acceleration. — In the foregoing paragraphs onlythe torque to be exerted at the rim of the car wheels foruniform speed was determined. But in railway operationa number of stops must be made to allow passengers toboard or alight from the cars, or to take on or unloadfreight, and further, between these stops the velocity ofthe car must be such as to maintain the specified the car must be accelerated, and later brought to accelerate a car requires considerable tractive force in pounds acting on a body weighing w poundswhich produces a change of velocity of a feet per secondin one second is / = — = a pound
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