De thi dai hoc nam 2013 lan 2 mon vat ly cua Nhat Ban De thi dai hoc nam 2013 lan 2 mon vat ly cua Nhat Ban De thi dai hoc nam 2013 lan 2 mon vat ly cua Nhat Ban De thi dai hoc nam 2013 lan 2 mon vat ly cua Nhat Ban De thi dai hoc nam 2013 lan 2 mon vat ly cua Nhat Ban De thi dai hoc nam 2013 lan 2 mon vat ly cua Nhat Ban
A B C D E (acceleration due to gravity) A F G g M m F F F F0 1 F0 mg F0 Mg F0 (M + m)g (M + m)F Mmg B 3ℓ 3m A P PB 2 P B B M4(4 > 3m) A P x A x< m ℓ M x< 3m ℓ 2M x< 2m ℓ M x< 3m ℓ M C m M A 30◦ A 45◦ vA A B B B A vB vB vA √ 2m 2M √ √ 6m 3M 6m 2M √ 2m M D ( R) m A r (< R) A mgr mgR √ mg R − r 2 mgr mgr 2R √ R2 − r 2R mgrR √ R2 − r mgr √ R2 − r E 0.90m 0.40kg 16N m/s 3.0m/s 6.0m/s 9.0m/s 18m/s 36m/s F m P 30◦ P AB √ h BC A BC CD C ℓ E ℓ 2h 4h h 4h G m M B A A B A B KA B A KB KA KB m2 M2 m M M m M2 m2 A( A 1) B( 2) C( 3) 200g 40J/K 20◦ 4.2J/(g K) 20V 1 A 0.22A 0.44A 2.2A 4.4A 22A 44A B S p0 V0 M µ (acceleration due to gravity) g µMgV0 S 3µMgV0 2S 5µMgV0 2S (µMg − p0S)V0 S 3(µMg − p0S)V0 2S 5(µMg − p0S)V0 2S C B C D A B C D p −V A UA UB UC UD UA UB UC UD 10 UA > UB = UD > UC UB > UA = UC > UD UC > UB = UD > UA UD > UA = UC > UB 10 A( 1) B( 2) C( 3) A x 2 a e 11 b d a c e c a e a c e b d a e c 11 B f1 A f2 V A 12 f 1V f2 2f 2V f1 f 1V 2f 12 f 2V 2f C ℓ 600nm nA B A 1.00 nB A B nA − n B 6.0 × 103 1nm=109 m A B ℓ 13 1.0 × 10−3 m 5.0 × 10−4 m 2.0 × 10−4 m 1.0 × 10−4 m 5.0 × 10−5 m 2.0 × 10−5 m 13 A( A 1) B( 2) C( 3) D( x = −a(a > 0) x 4) E( 5) F( 6) q(q > 0) x = 2a −q k O x Ex V 14 Ex V 3kq 4a kq − 2a 3kq 4a kq + 2a 3kq 4a 3kq + 2a 14 5kq 4a kq − 2a 5kq 4a kq + 2a 5kq 4a 3kq + 2a B q q>0 q q 0) E A E B EC A B C E A E B EC 15 E A > E B > EC E A > EC > E B E B > E A > EC E B > EC > E A EC > E A > E B EC > E B > E A 15 C 4.5V b 4.0kΩ 5.0kΩ 6.0kΩ 9.0kΩ a 16 −0.3V −0.2V −0.1V 0.1V 0.2V 0.3V 16 D 10V 2 17 2.0W 4.0W 10W 12W 6.0W 17 8.0W E a A B m q(> 0) P v O Q 2θ A P A r A Q tan θ 18 aqB mv amv qB mv aqB 18 qB amv F a b a b f a b f 19 a 19 b ... m2 M2 m M M m M2 m2 A( A 1) B( 2) C( 3) 20 0g 40J/K 20 ◦ 4.2J/(g K) 20 V 1 A 0 .22 A 0.44A 2. 2A 4.4A 22 A 44A B S p0 V0 M µ (acceleration due to gravity) g µMgV0 S 3µMgV0 2S 5µMgV0 2S (µMg − p0S)V0... B f1 A f2 V A 12 f 1V f2 2f 2V f1 f 1V 2f 12 f 2V 2f C ℓ 600nm nA B A 1.00 nB A B nA − n B 6.0 × 103 1nm=109 m A B ℓ 13 1.0 × 10−3 m 5.0 × 10−4 m 2. 0 × 10−4 m 1.0 × 10−4 m 5.0 × 10−5 m 2. 0 × 10−5... PB 2 P B B M4(4 > 3m) A P x A x< m ℓ M x< 3m ℓ 2M x< 2m ℓ M x< 3m ℓ M C m M A 30◦ A 45◦ vA A B B B A vB vB vA √ 2m 2M √ √ 6m 3M 6m 2M √ 2m M D ( R) m A r (< R) A mgr mgR √ mg R − r 2 mgr mgr 2R