A two-wheel-drive tractor has drive-wheel rolling radius 860 mm, engine-to-wheel speed ratio 98:1, transmission efficiency 86% and engine torque 520 N m. Find ground thrust in kN, to two decimals.
The total delivered wheel torque is $520(98)(.86)=43825.6$ N m. Divide by radius .860 m: thrust=50960 N, or **50.96 kN**. The stated torque is transmitted to the drive axle as a whole; it should not be doubled for two wheels.
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