gaoyns 发表于 2012-11-25 16:49 static/image/common/back.gif u- `: e( Y, z; L# N( i
若不计三角块的重力,设向左的分力为T,T=F tan α .# P) E' S+ g$ n/ N
α越大,F也越大,当α趋近90°时T达到极限,当α= ...
gaoyns 发表于 2012-11-25 16:49 static/image/common/back.gif* N# L' N* }5 F4 {4 L9 C) t- u
若不计三角块的重力,设向左的分力为T,T=F tan α .: ~! L' T4 P/ R3 U! A
α越大,F也越大,当α趋近90°时T达到极限,当α= ...