hw13_soln

hw13_soln - cg) A 3—H) particle is acted upon by a force...

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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 ZOOO-kg 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 "‘ A; 5’ 1‘ A] “h > .4: v I Chi! Qé‘x’wfx‘ylfggfgttfi’fl 0 1L E g f a 9 i ; Wrwawvfw {N} A if *: C? 009 r r {:53 V 5"" / 3 t ww Lee7 ; 41.. v 0” 1’ ~ V ~ k A r f 27:13“ {N} ("‘33, F]; * 43v ‘ a "tie! mmfiwé ~22 *1 ail/L r’ mg)?th g If A v Lake V (907’ g“? ,. , x ,, WA, g» :: ~27 r {1:341 it s"?ifL,«r3%“é-s H 31v (if vtwggetéiziféiew “‘ ' E g, :r f V t 3 5 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‘ a f ’ 3mm “Hr/m aim/{mm L J2.» C / i M ¥ f i ‘ It, ’ :fi, {/4 ‘ AA} fit“; me» F In 54 “he. é!3*8<%?%i3’10233j gem}; ngea‘Daéifi ; fi‘istag 55633,. _ i W n 3/1? “.3 / fl" /‘ A A ff f; f‘ w [w figggrff *3 /‘ {7304); CL 1% ...
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hw13_soln - cg) A 3—H) particle is acted upon by a force...

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