1、 1 (2016 ) ( ) ( ) ( A ) A B C D ,( 1 ) ,( 2 ) 2 (2015 ) ( C ) A B C D 3 (2015 )( ) 8N 3 kg/m 3 6N ( ABC ) A 2N B 0.8kg C 0 4 m 3D 3 g/cm 34 (2016 ) ( B ) A B C D 5 (2016 ) G F t ( A ) ,A) ,B) ,C) ,D) 6 (2016 ) ( ) ( C ) A B C D 7 (2016 ) 5N 5N _5_N _ _( _5_N 8 (2016 ) S l h1 h2 (1) _ _ _ _ (2) F F2
2、 F1 2S 1S (h2 h1) m g G 9 (2015 ) A (1) A _ _ _ _ (2) A _ _ 10 (2016 ) x ( F1 F2 F3 F4) (1) _ ( )_ (2) ( )_F2 F1_ _F3 F4_( )( F1 F2 F3 F4 ) (3) x _ F2 F3 F4 _( F2 F3 F4 ) 11 (2016 ) 10cm 0.7g/cm 3 ( )(g 10N/kg) (1) (2) (3) V V (10cm) 3 1000cm 3 1 10 3 m 3 F gV 10 3 kg/m 3 10N/kg 1 10 3 m 3 10N (2)G
3、mg 3 kg/m 3 1 10 3 m 3 10N/kg 7N F F G F F G 10N 7N 3N (3) F G F F G F G G F F F G F (G G ) F G 10N 7N 3N 12 (2016 ) 100cm 2 400g 16cm 40cm 2 8cm F h ( g 10N/kg) (1) (2) (3) (1) G 10N F 6N F G F 10N 6N 4N (2) V 40cm 2 8cm 320cm 3 4 m 3 V 1.6 10 4 m 3 F gV 4N 10N/kg 1.6 10 4 m 3 2.5 10 3 kg/m 3 (3) m V 2.5 10 3 kg/m 3 100 16 10 6 m 3 4kg G m g (0.4 44N F G F 44N 4N 48N p F S 48N 100 10 4 m 2 4800Pa
