作者kohsouan (kohsouan)
看板Physics
标题[问题] 大一物理 请教一下
时间Tue Nov 6 11:18:02 2007
[领域] (题目相关领域)
物理
[来源] (课本习题、考古题、参考书...)
课本习题
[题目]
<6.80>A physics professor is pushed up a ramp inclined upward at 30.0度
above the horizontal as he sits in his desk chair that slides on
frictionless rollers.the combined mass of the professor and chair is
85.0kg.he is pushed 2.50m along the incline by a group of students who
together exert a constant horizontal force of 600N.the professor’s
speed at the bottom of the ramp is 2.00m/s.
Use the work-energy theorem to find his speed at the top of the ramp
[瓶颈] (写写自己的想法，方便大家为你解答)
我的想法是 1/2M(V1)^2+学生作的公=1/2M(V2)^2+MGH
不太董题目的意思.... 到底是怎麽推的...
用沿着斜面推 怎麽算起来 会无解= =(是我笨吗...)
沿着水平推 数字有丑 课本後面应该会有解答的阿= =
谢谢了!
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