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De thi dai hoc nam 2014 lan 2 mon vat li cua Nhat Ban De thi dai hoc nam 2014 lan 2 mon vat li cua Nhat Ban De thi dai hoc nam 2014 lan 2 mon vat li cua Nhat Ban De thi dai hoc nam 2014 lan 2 mon vat li cua Nhat Ban De thi dai hoc nam 2014 lan 2 mon vat li cua Nhat Ban
A B C D E (acceleration due to gravity) A F G g a h A A h mg a a mg h h √ mg a + h2 a √ mg a2 + h2 √ a2 + h2 mg a √ a2 + h2 mg h B 0.50m A B A 0.40m 12N A N 6.0 8.0 10 12 N C x v t t x 3 D α θ v0 A A A A h v0 √ cos θ √ sin θ 2gh sin α √ 2gh cos θ √ 2gh sin α cos θ 2gh sin α √ 2gh sin θ √ 2gh sin α sin θ E A m v0 h A √ 2gh √ 4gh − v02 √ v02 − 2gh √ gh − v0 v0 − √ 2gh F 3m A m B A B 4v A v A B A θ tan θ 4 5 G r 2r O P O r Q P m A A Q A mg 2mg 3mg 4mg 5mg 6mg A B C −20◦ C A 43◦ C 0◦ C 3.3 × 102 J/g 4.2J/(g·K) 2.1J/(g·K) % 26 42 58 74 % B S m Q d (acceleration due to gravity) g p d 2Q 5(pS + mg) 2Q 3(pS + mg) 2Q 5(pS − mg) 2Q 3(pS − mg) p−V C p B A B B C C C C V A B C A A B A A 10 A B B C C A 0 0 0 10 A A x B C 0.50m/s x = 0m y t x = 0.45m y t 11 11 B L1 L2 (> L1 ) n LL1 f1 L2 − L1 L1 12 pt n f1 − n n f1 n f1 + n 2n f1 − n 2n f1 2n f1 + n 12 C 0.90m 2 m 13 m 0.10 0.20 0.30 13 0.40 A( A 1) B( xy O 2) C( 3) D( A( a , ) (a > 0) E0 C( −2a , ) Q 4) E( 5) F( 6) Q(> 0) A B( , a ) Q O E1 E1 E0 14 √ 5 √ 41 14 √ 13 B E0 2d A E1 A −d x x A O x E0 A x d V 15 15 C R A V I 16 V 3R 2V 5R 4V 7R 16 8V 7R D S d V ε0 2ε0 Q Q 17 2ε0 SV 3d 2dV 3ε0 S 4ε0 SV 3d 17 4dv 3ε0 S E O x y x I0 y xy x0 xy y ( x0 , y0 ) 2I0 y0 18 y0 = x0 y0 = − x0 y0 = 2x0 18 y0 = −2x0 F V r V r T T 19 r √ √ √ 2 T √ √ 2 2 19 ... 12N A N 6.0 8.0 10 12 N C x v t t x 3 D α θ v0 A A A A h v0 √ cos θ √ sin θ 2gh sin α √ 2gh cos θ √ 2gh sin α cos θ 2gh sin α √ 2gh sin θ √ 2gh sin α sin θ E A m v0 h A √ 2gh √ 4gh − v 02 √ v 02. .. v 02 − 2gh √ gh − v0 v0 − √ 2gh F 3m A m B A B 4v A v A B A θ tan θ 4 5 G r 2r O P O r Q P m A A Q A mg 2mg 3mg 4mg 5mg 6mg A B C ? ?20 ◦ C A 43◦ C 0◦ C 3.3 × 1 02 J/g 4.2J/(g·K) 2. 1J/(g·K) % 26 42 58... L1 ) n LL1 f1 L2 − L1 L1 12 pt n f1 − n n f1 n f1 + n 2n f1 − n 2n f1 2n f1 + n 12 C 0.90m 2 m 13 m 0.10 0 .20 0.30 13 0.40 A( A 1) B( xy O 2) C( 3) D( A( a , ) (a > 0) E0 C( −2a , ) Q 4) E( 5)