是.
首先,刚开始弹簧平衡:
mg=kx;
向下拉的时候:
F合力=mg-k(x+x')
将上述两式联立得
F合力=-kx'
猜你喜欢
- 1为什么说金瓶挚签制度的确立,表明中央政府加强了对西藏地区的管辖?
- 2与气象物候相关的俗语或谚语
- 3The teacher said to his class,"Don`t waste your time!"直接引语改间接引语
- 4《我终于战胜了自己》600字以上初一作文
- 5She usually go to school at 8:00.病句吗
- 6Good.Do you like working here?Yes,I do.I like it a________.And I like Chinese,too.
- 7My home is about ____ from my school.A 15 minutes B 10 minute's ride C 20 minutes by bike
- 8数列{an}满足a1=0,a2=2,an+2=(1+cos^πn/2)an+4sin^2nπ/2 1.求a3,a4 2.设Sk=a1+a3+……+a2k-1,求Sk
- 9将8.8g表面被氧化的镁带样品全部放入100g稀盐酸中,恰好完全反应收集到氢气0.4g,求:
- 10一个盛有酒精的容器,底部受到酒精产生的压强为3200帕,求酒精的深度?