如图所示装置,绳重即摩擦不计(1)当物重为50N时,绳端需用20N的拉力才能使物体匀速上升,此时该滑轮组的机械效率是多少?(2)当物重是90N时,绳端需用多大的力才能使其匀速上升?(3)如果绳子能承
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/04 23:09:57
![如图所示装置,绳重即摩擦不计(1)当物重为50N时,绳端需用20N的拉力才能使物体匀速上升,此时该滑轮组的机械效率是多少?(2)当物重是90N时,绳端需用多大的力才能使其匀速上升?(3)如果绳子能承](/uploads/image/z/4587309-45-9.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E8%A3%85%E7%BD%AE%2C%E7%BB%B3%E9%87%8D%E5%8D%B3%E6%91%A9%E6%93%A6%E4%B8%8D%E8%AE%A1%281%29%E5%BD%93%E7%89%A9%E9%87%8D%E4%B8%BA50N%E6%97%B6%2C%E7%BB%B3%E7%AB%AF%E9%9C%80%E7%94%A820N%E7%9A%84%E6%8B%89%E5%8A%9B%E6%89%8D%E8%83%BD%E4%BD%BF%E7%89%A9%E4%BD%93%E5%8C%80%E9%80%9F%E4%B8%8A%E5%8D%87%2C%E6%AD%A4%E6%97%B6%E8%AF%A5%E6%BB%91%E8%BD%AE%E7%BB%84%E7%9A%84%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87%E6%98%AF%E5%A4%9A%E5%B0%91%3F%282%29%E5%BD%93%E7%89%A9%E9%87%8D%E6%98%AF90N%E6%97%B6%2C%E7%BB%B3%E7%AB%AF%E9%9C%80%E7%94%A8%E5%A4%9A%E5%A4%A7%E7%9A%84%E5%8A%9B%E6%89%8D%E8%83%BD%E4%BD%BF%E5%85%B6%E5%8C%80%E9%80%9F%E4%B8%8A%E5%8D%87%3F%283%29%E5%A6%82%E6%9E%9C%E7%BB%B3%E5%AD%90%E8%83%BD%E6%89%BF)
xSNQ~҄9sj:Ȯ`JB+1q Z@Q
BH,dΙv+.5ą|2(ݜk_Y7s~g7{5ZgKly;uwG!Y+0ef+|K-,{^5Vuu) 2}QyGUZ@
^vv,Տه=쿜goJƢZ_Eb#ҹ~ű(mtgX4eN>X''B.J!I 2*(ͬ{_f=ФA¤L*;91`=4
=}ȼud0mL%N"gr\!aYqM
O3Y O2䎂 !$SXĒLǶ-dGMJl9a414`IIEWֈ+H2\z]E\(kI*थ^\B~4'e2qZ!װc