www.webssign revwebnNdent/Anagnnert. Resperessen.hkp-17M1 Need Help? 40 0-kg pra
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Question
www.webssign revwebnNdent/Anagnnert. Resperessen.hkp-17M1 Need Help? 40 0-kg prajectile is fired at an angle d 300" above the eortal with as intial speed of 144 m/ from thhe top a a ct 153 m with above level ground, whae ground is ta a)what b ikal total mechanical erergy al the projetlo (a.e your an er to at lui response difers from the comet arower by more than 10% Doutle check your caloattiers 3 b) Suppose the srojectile is traveing 102.3 mys at hs maximum height of y34 m. How nuch work has bee tene on the grajectle ty t bicten? 22711 B Your reaponse dffers trom the correct annser y more than 10s%. Doubla chack your cakoratiors. 3 (c) what-the apeed at the prjotile immediately belore it hits the ground r air friction des o ..nd when it was going sp? 216 9 yeur response ders from the comect anever by more than 100% ms hat tmec .s mach "n on tbe projed1·when " dara at ad Need Help? H ss rain isetad at tte 0.2 pc-kg tiock along a horizontal track has è Speed eri amo mnadatey before celing whh a light 'rig d tree orene aj what is the spring's maximum compression i the track is frictionless?Explanation / Answer
(A) total ME= PE + KE
= (40 x 9.81 x 155) + (40 x 158^2 / 2 )
= 5.60 x 10^5 J
(B) total energy = (40 x 102.2^2 /2 ) + (40 x 9.81 x 374)
= 3.56 x 10^5 J
Work done by air friction = (3.56 - 5.60) x 10^5
= - 2.04 x 10^5 J
(C) work done by friction = (1 + 1.5) (-2.04 x 10^5)
= -5.1 x 10^5 J
KE = (5.60 - 5.1) x 10^5
v = 50 m/s
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