早教吧 育儿知识 作业答案 考试题库 百科 知识分享

aboxofmass1kgispulled50cmalongalevelfloorbyahorizontalforceof5N.Theboxisthenraisedverticallyontoatablecmhigh.whatisthetotalworkdoneonthebox?g=1oNworkdonebythehorizontalforceworkdonebyverticalforce意思

题目详情
a box of mass 1 kg is pulled 50 cm along a level floor by a horizontal force of 5N.The box is then raised vertically onto a table cm high.what is the total work done on the box?g=1oN
work done by the horizontal force
work done by vertical force
意思大概是1个箱子重1kg推了50cm沿着水平方向的水平力是5N,然后这箱子垂直上升了80CM
问水平力
垂直力
▼优质解答
答案和解析
不是问的水平力,问的是对这个箱子的总功
在水平面上做功W1=5*0.5=2.5J
抬到桌面克服重力做功W2=mgh=10*0.8=8J
总功=10.5J
【俊狼猎英】团队为您解答