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由题知F1=6N,△L1=4cm,△L2=5cm,
根据弹簧的伸长量与弹簧所受拉力成正比得:F1:F2=,△L1:△L2,
解得F2=7.5N.
故答案为:7.5
点评:
本题考点: 弹簧测力计及其原理.
考点点评: 本题的解题关键是运用“在弹簧的弹性限度以内,弹簧的伸长量与弹簧所受拉力成正比”.
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