如图甲所示,一质量为m=1kg的小物块静止在粗糙水平面上的A点,从t=0时刻开始

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问题:

如图甲所示,一质量为m=1kg的小物块静止在粗糙水平面上的A点,从t=0时刻开始,物体在受如图乙所示规律变化的水平力F作用下向右运动,第3s末物块运动到B点时速度刚好为零,第5s末物块刚好回到A点,已知物块与粗糙水平面间的动摩擦因数μ=0.2,则物体从A运动到B间的平均速度为______m/s,水平力F在5s时间内对小物块所做功的功率______W.

考点:平均功率和瞬时功率的区别平均速度和瞬时速度的区别
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任务型阅读。根据短文内容填入相关的信息,完成下列表格。
     Mike is the manager of a computer company. He is going to Shanghai for an important meeting. The meeting
will start on September 24th. When he calls the booking office for a ticket, he is told that there are only flights to
Shanghai on September 23rd. One is at 10:30 in the morning, and the other is at 3:30 in the afternoon. Mike can't
leave until lunch time, so he has to take the 3:30 flight. The flight number is BA345, He has to pay 800 yuan plus
another 50 yuan for the airport construction fee (建设费).
Name Mike
Destination (目的地) 1.___________.
Date September 23rd
Time 2.___________.
Ticket price 3.___________.
Total cost (总费) 4.___________.
For what 5.___________.
题型:填空题

代谢性脑病的脑电图特征()。

A.早期出现三相波

B.早期出现局灶性慢波

C.后期出现三相波

D.后期出现局灶性慢波

E.在代谢性紊乱得以纠正时,脑电图异常将持续存在

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在同一条件下进行磁粉探伤,交流磁化法比直流磁化法对近表面内部缺陷的检测灵敏度高。

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蒸馏易燃、易挥发物品时应注意什么?

题型:填空题

对供应商进行分类,再在不同类型的供应商中择优挑选是供应商管理的基础和前提。

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