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3、 /N /N 1 6 1.5 2 6 2.8 3 12 5.6 4 12 (1) 1 2 3 _ _ (2) 1 2 _B_( _ ( ) ( )_ (3) 4 (4) 15cm _30_cm 80% 4 _3.5_N( ) 21 (1) m h v mgh 1 2 mv 2 h 0.2m g 10N/kg _2_m/s (2) v0 t x v0t y 1 2 gt 2 y t 2 _b_ (3) AB A BC B C E D C CD 1.25m g 10N/kg DE 2m AB _1.6_m (22 7 23 7 14 ) 22 (6 ) R1 R2 S1 0.8A S2 0.4A
4、(1) (2) R2 (3) (1) S1 R1 R1 I U R U I1R1 8V (2) S1 S2 R1 R2 A R1 0.8A R2 I2 0.4A R2 R2 U I2 8V 0.4A (3) I 3A R2 I2 I I1 3A 0.8A 2.2A R2 2A I I1 I2 0.8A 2A 2.8A P UI 22.4W 23 (8 ) 40N 4m AB O AO 1m B C AB 60N 50N M F 10N AO v 1m/s B (1) (2) F (3) AB (1) f F 10N (2)P F v 10W (3) M O O L1 T 0 GL1 GOA 1 2 LOA GOB 1 2 LOB 50N L1 1 2 1m 1 2 3m L1 0.8m M O O L2 T 60N GOA 1 2 LOA G 1 2 GOB L 2 LOB T LOBsin30 1 2 1m L2 1 2 3m 1 2 L2 1m O 0.8m 1m AB
