C = C + C 1 2 3 1 1 1 1 + C = + + C C C C 1 2 3
17 Q = Q = Q C = Q U C 1 1 2 3 C 1 C 2 C 3 U = 1 1 1 U 1 U 2 U 3 = + + C C C 1 2 3
1) A B U A U B U U = AB A B AB G G R =
R U = U U = 0 U = 4 B C BC CB C C 1 2 R R R / R = C./C 1 2 1 2 1 U U C C 2 B C 1 2 = 3 R = 6 R = 9 AB 18V K K U 5 6 1 2 U = K K CD EF Q 1 2 P
= m V 1 ρ m V
2 1 F = F + F + 2F F COSθ tgα = F F 2 + F 1 2 2 2 sinθ cosθ 1 2
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1)
10 1 11 (1) 1 (2) (3) a F F v (4) 2 1
M T = mg M + m M 1 T mg M + m v = V + at = V + F m t V F 0 0
1 2 3 V m 4 5 1 2 3 4 5
c A B U = B AB A
8 A B ε= 3 5.4 10 E = A