本题目来源于试卷: Physics Unit9: Static Equilibrium, Elasticity and Fracture，类别为 通用国际物理
[单选题]
Two telephone poles are7,di t)edsh. ebsx5 m; s 7ar 6duqb sq6dv+1q *+-bhiyxeparated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below horizontal. Assuming the wire has negligible mass, 1a -irhdxd su q6* q+76v+qbybwhat is the tension in the wire?
A. $6.2 \; N$
B. $12 \; N$
C. $25 \; N$
D. $50 \; N$
参考答案: C
本题详细解析:
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