Grade 12 Physics Exam Review

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1 Grade 12 Physcs Exam Revew 1. A 40 kg wagn s pulled wth an appled frce f 50 N [E 37 degrees abve the hrzntal. The wagn mves 8 m [E] hrzntally whle 5 N f frctn act. Fnd the wrk dne n the wagn by the... a) appled frce b) net frce c) frctn frce d) frce f gravty 2. State the frmulas fr... a) gravtatnal ptental energy near the earth's surface.. -*4- k&fm 3 J '. g) n) rbtal speed gravtatnal feld strength n the surface f a planet 4. A 4..a 2 the kg ball mvng at 5 m/s [E] clldes head-n and elastcally wt! kg ball mvng at 4 m/s [W]. Fnd the velcty f each ball after cllsn. K \ fsc

2 page #2 Tw ludspeakers are prducng crcular waves f 7 meter wavelength n phase. A persn n the sxth ndal lne s 50 meters frm ne surce. What are the pssble dstances f the persn frm the ther surce. A sprng s cmpressed 8 cm usng a steady frce f 64 N. What s the Hke's frce cnstant fr the sprng? Derve the alternate frm f Newtn's secnd [aw. A- 3 kg ball s mvng at 8 m/s [N30W] when t hts anther 6 kg ntally at rest, the 3 kg ball glances ff at 4 m/s [N53W]. Fnd the mmentum anf the velcty f the 6 kg partcle. 11. A Hke's law sprng s cmpressed 10 cm by an appled frce f 50 N. The cmpressed sprng s then used t prject a 20 g marble straght up nt the ar. T what maxmum heght des the marble rse? 12. A 3000 kg car mvng at 30 m/s [E] takes 10 sec t turn a crner. The fnal velcty f the car Is 40 m/s [N]. Fnd the acceleratn and net frce n the car. 13. Wrte the vectr chan rule fr ar navgatn and rver-crssng questns and revew nte and hmewrk examples. Fnd the acceleratn and tensn n the fllwng system f a) there s n frctn b) the ceffcent f frctn between nclne and blck s 0.2

3 page #3 15. What mnmum ceffcent f statc frctn s necessary t keep the system n #14 at rest? 16. A 30 degree nclne has a blck n t. What s the mnmumum ceffcent f statc frctn between blck and nclne t keep the blck at rest n the nclne? 17. A 60 kg lady s n the surface f a planet whch s fur tmes the earth's radus and sx tmes the mass f the earth. Hw much des she wegh n Newtns? 1 8. Fr unfrm crcular mtn, state a) the drectn f the nstantaneus velcty b) the drectn f the accleratn c) wty there s acceleratn d) the 3 frmulas fr the sze f the centrpetal acceleratn e) what the centrpetal frce s 19. Fnd the acceleratn f a grl n the edge f a merry-g-rund f dameter 10 m mvng at a cnstant speed f 36 km/h. : 20. What frequency s needed t prduce a 9.8 m/s/s centrpetal acceleratn n a washng machne f the radus s 30 cm? 21. A 4 kg stne s beng twrled n a vertcal crcle at a cnstant speed f 5 m/s and wth radus 1.00 m. a) What s the actual weght f the stne? b) What s the centrpetal frce requred? c) What s the magntude f the tensn frce at.. ) the tp f the crcle ) the bttm f the crcle d) What s the mnmum speed that the stne must be twrled just t g arund a crcle f ths radus? 22. Revew cnservatn f lnear mmentum, partcularly the frg.ily pad and cuplng cllsns examples frm the ntes. an rbtal radu em-po mlln km uul rpeul uf 400 lays»!"'"" ""-thtr rlnn-t, [ I m ' ':" -"rr-tf f ' '" -f *M n nv'f'f u " _ a ) t h P pg"**"* nf plamrt-

4 page#4 Blue lght f wavelength 420 nm passes thrugh tw very narrw slts. A Yung's dfractn pattern Is bserved n a screen 5 m away. The dstance between the frst and ffth ndal lne s 8.0 cm. What s the separatn between the tw slts? A cannnball s prjected ff a 120 m hgh clff at a speed f 130 m/s at an angle f 22.5 degrees t the hrzntal. Hw lng s the cannnball n the ar? what s the maxmum heght f the cannnball abve the grund? What s the ttal velcty f the cannnbal just befre t hts grund? Revew all cnservatn f mechancal energy and cnservatn f mmentum prblems. Revew the bullet-sandbag prblem. GOOD LUCK!!

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