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1.       For the trailer hitch of Problem 3-4, determine the horizontal force that will result on the ball from accelerating a 2 000-kg trailer to 60 m/s in 20 sec. Assume a constant acceleration. Size and specify the bolts and their preload for a safety factor of at least 1.7.‡

2.       For the trailer hitch of Problem 3-4, determine the horizontal force that will result on the ball from an impact between the ball and the tongue of the 2 000-kg trailer if the hitch deflects 1 mm on impact. The tractor weighs 1 000 kg. The velocity at impact is 0.3 m/s. Size and specify the bolts and their preload for a safety factor of at least 1.7.‡

 

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