Question: this question is from dynamics. The hydraulic braking system for the truck and trailer is set to produce equal braking forces for the two units.

this question is from dynamics.

The hydraulic braking system for the truck and trailer is set to produce equal braking forces for the two units. If the brakes are applied uniformly for 8 seconds to bring the rig to a stop from a speed of 30 mi/hr down the 10-percent grade, determine the magnitude of the force P in the coupling between the trailer and the truck. The truck weighs 21,000 lb and the trailer weighs 13,000 lb. El Answer: P = 398'726 lb the tolerance is +/-2%

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