1、 - 1 - 05 1 2017 50Hz 1 C A B C D 2 BC 3 W v W v AB A W B W C W v 2D W v 3 2 3 1 - 2 - ABD C C 2 BC 3 y=x n n=2 3 4 AB CD AB 1 C 2 BC 3 AB 2 )(7 ) B ( ) M m d g A F t (1) m M _( (2) AB L _( ) (3) ( ) A AB B C D (1) m M - 3 - (1) (2)FL 1 2 M( d t ) 2(3)AD 3. ( ) (1) _ ( ) A B C (2) O A B C 50 Hz B _
2、m/s( ) (1) A B C (2)vB AC 2T 18.59 5.53 10 2 0.2m/s 0.653 m/s (1)C (2)0.653 - 4 - 4 ( ) A B C D ABC 5 ) O O ( ) Ep 1 2 k( x) 2 (1) _ _ ( ) (2) x t1 (3) 2 x 3 x 4 x - 5 - t2 t3 t4 (4) W1 W2 W3 W1 W2 W3 _ W 1 t 2 _( ) (4) Ep 1 2 k( x) 2 W1 W2 W3 W1 W2 W3 1 4 9 W 1 t 2 (1) (4)1 4 9 6 a F m (1) _ (2) O
3、0.1 s A B C D E F G 0.2 N 0.2 kg - 6 - W Ek ( ) O B O C O D O E O F W/J 0.043 2 0.057 2 0. 073 4 0.091 5 Ek/J 0.043 0 0.057 0 0.073 4 0.090 7 W Ek (3) 7.7 10 3kg _kg(g 9.8 m/s 2 ) (1) ( ) (2) 0.111 5 0.110 5 (3)0.015 7 - 7 - (1) M 7m 50 Hz m 100 g M 1 kg O A B C 3 4 B Ek _ J B W _ J ( 2 g 9.8 m/s 2
4、) (2) (1) W Ek _ ( ) (2) (1)0.50 0.51 (2) ( ) 8 ) 1 kg 6 V 50 Hz O A B C D E F G ( ) O 31.4 70.6 125.4 195.9 282.1 383.8 501.2 mm 9.8 m/s 2 - 8 - (1) B C D E F B C D E F 1 ) (2) B C D E F (J) (3) _ _ _ _ (3) - 9 - v 2 (1)1.18 1.57 1.96 2.35 2 74 (2)0.69 1.23 1.92 2.76 3.76 (3) WG v 2 v 2 9 ) B ( ) (
5、1) d d _ cm (2) t s _ A s t B s t 2C s t 1D s t 2(3) _ A B C (1) 10 mm 0.05 15 mm 1.075 cm - 10 - (1)1.075 (2)D (3)C 10 Q P AB P BC B C C g Q m AB R BC L CC h Q A Q D 10 10 C s (1) Q B EkB _ Q C EkC _ Q B C Q WFf _ Q P _ (2) _ - 11 - _ ( ) B C WFf EkC EkB WFf mgs 2 4h mgR WFf mgR mgs 2 4h WFf R L s 2 4hL(2) ( B ) (1) mgR mgs 2 4h mgR mgs 2 4h R L s 2 4hL(2) ( B ) 11 )(6 ) - 12 - (1) M1 (2) 2 3 4 (1) M2 M3 M4 (3) _( g ) A m B x C x D h E L W1 W2 W3 L1 L2 L3 W _ _( ) ADE L 2
