图11所示,某人在筐内,人重400n,筐重90n,动�轮重20n。此人用动�轮将自己匀速拉起。不计�擦和绳重,求人对绳子拉力多大?人对筐底压力 Template




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tomski图11所示,某人在筐内,人重400n,筐重90n,动�轮重20n。此人用动�轮将自己匀速拉起。不计�擦和绳重,求人对绳子拉力多大?人对筐底压力 coloring