150_cau_tN_vat_ly_12_KPB_430_10516223

150_cau_tN_vat_ly_12_KPB_430_10516223 - tng n tp H v tn hc...

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§Ò tæng «n tËp th¸ng 09 – 2008. Hä vμ tªn häc sinh :…………………………… ...................... M· ®Ò 699 1. Ph¬ng tr×nh täa ®é cña mét chÊt ®iÓm M dao ®éng ®iÒu hßa cã d¹ng: x = 6sin(10t- π ) (cm). Li ®é cña M khi pha dao ®éng b»ng π 6 - A. x = 30 cm B. x = 32 cm C. x = -3 cm D. x = -30 cm 2. Mét con l¾c ®¬n cã chiÒu dμi l 1 dao ®éng ®iÒu hßa víi chu k× T 1 = 1,5s. Mét con l¾c ®¬n kh¸c cã chiÒu dμi l 2 dao ®éng ®iÒu hßa cã chu k× lμ T 2 = 2 s. T¹i n¬i ®ã, chu k× cña con l¾c ®¬n cã chiÒu dμi l = l 1 + l 2 sÏ dao ®éng ®iÒu hßa víi chu k× lμ bao nhiªu? A. T = 3,5 s B. T = 2,5 s C. T = 0,5 s D. T = 0,925 s 3. Chän ph¸t biÓu ®óng trong nh÷ng ph¸t biÓu sau ®©y. A. Khi chÊt ®iÓm qua vÞ trÝ c©n b»ng th× vËn tèc vμ gia tèc cã ®é lín cùc ®¹i. B. Khi chÊt ®iÓm qua vÞ trÝ c©n b»ng th× vËn tèc cùc ®¹i vμ gia tèc cùc tiÓu. C. Khi chÊt ®iÓm ®Õn vÞ trÝ biªn th× vËn tèc triÖt tiªu vμ gia tèc cã ®é lín cùc ®¹i. D. Khi chÊt ®iÓm ®Õn vÞ trÝ biªn ©m th× vËn tèc vμ gia tèc cã trÞ sè ©m. 4. Ph¬ng tr×nh dao ®éng ®iÒu hßa cña mét chÊt ®iÓm M cã d¹ng x = Asint (cm). Gèc thêi gian ®îc chän vμo lóc nμo? A.. VËt qua vÞ trÝ x = +A B.. VËt qua vÞ trÝ c©n b»ng theo chiÒu d¬ng C. VËt qua vÞ trÝ x = -A D. VËt qua vÞ trÝ c©n b»ng theo chiÒu ©m 5. Mét vËt cã khèi lîng m treo vμo lß xo cã ®é cøng k. KÝch thÝch cho vËt dao ®éng ®iÒu hßa víi biªn ®é 3cm th× chu k× dao ®éng cña nã lμ T = 0,3s. NÕu kÝch thÝch cho vËt dao ®éng ®iÒu hßa víi biªn ®é 6cm th× chu k× dao ®éng cña con l¾c lß xo A. 0,3 s C. 0,6 s B. 0,15 s D. 0,423 s …………………………………………………………………………………………………… …………… [email protected] – Líp 12 chuyªn VËt lý 2008 - ¤n thi ®¹i häc- M· ®Ò 699 Trang 1
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6. Ph¬ng tr×nh täa ®é cña 3 dao ®éng ®iÒu hßa cã d¹ng 2sin ( ), 3sin( ) ( ), 2 cos( )( ) 2 3 2 1 t cm x t cm x t cm x π ϖ ϖ ϖ = - = = KÕt luËn nμo sau ®©y lμ ®óng? A. x 1 , x 2 ngîc pha. B. x 1 , x 3 ngîc pha C. x 2 , x 3 ngîc pha. D. x 2 , x 3 cïng pha. 7. §iÒu nμo sau ®©y lμ sai khi nãi vÒ n¨ng lîng trong dao ®éng ®iÒu hßa cña con l¾c lß xo? A. C¬ n¨ng cña con l¾c lß xo tØ lÖ víi b×nh ph¬ng biªn ®é dao ®éng. B. Cã sù chuyÓn hãa qua l¹i gi÷a ®éng n¨ng vμ thÕ n¨ng nhng c¬ n¨ng ®îc b¶o toμn. C. C¬ n¨ng cña con l¾c lß xo tØ lÖ víi ®é cøng k cña lß xo. D. C¬ n¨ng cña con l¾c lß xo biÕn thiªn theo quy luËt hμm sè sin víi tÇn sè b»ng tÇn sè cña dao ®éng ®iÒu hßa. 8. Cho dao ®éng ®iÒu hßa cã ph¬ng tr×nh täa ®é: x = 3cost (cm). Vect¬ Fresnel biÓu diÔn dao ®éng trªn cã gãc hîp víi trôc gèc Ox ë thêi ®iÓm ban ®Çu lμ A. 0 rad B.
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