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Unformatted text preview: cg) A 3—H) particle is acted upon by a force F = (20 sin Ztﬁ :‘cos 2t)j, Where F is expressed in pounds and t in seconds. Determine
'agnitude and direction of the velocity of the particle at t :76 5 know_ at its velocity is zero at t = 0‘ [3&3 _ .. ,
I 13.1 29 A tractor~trarier rig With a ZOOOkg tractor, a 4500—kg fraﬂex‘.
/ and a 3600—kg trailer is traveling on a levei road at 90 km/h. The brakes 923;: .44.. Me vii e the rear traiier fail and the antiskid system of the tractor and front trai
3% provide the largest possibleforce which will not cause the wheels to sit
Knowing that the coefficient of static friction is 0:75, determine (a) the Shaft
est time for the rig to come to a stop, (19) the force in the coupling hetw
the two trailers during that time. Assume that the force exerted by the
pling on each of the two trailers is horizontal. 90 km/h
@ 4500 kg ‘ r / 6; {'3 ‘ i
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E \IJ 13.140 A Player hits a 2—02 tennis ball with a horizontal initial V6 M t: Z (“1; «E r WU 1‘4 “1 34a ” i ity of 54 {US at a height of 4.5 ft. The bail bounces at point A and rises ff; .5} '3‘: A! U maximum height of 3 ft where the velocity is 30 ft/s. Knowing that \ duration of the impact is 0.004 3, determine the impulsive force exertec _ I « I Q "L if f 1 £2“ *3 the ball at point A. i :2: (j g, ‘9 QM 8% : I t f 7‘
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 Fall '08
 MOORTHY

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