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【简答题】
在 “力的合成的平行四边形定则”实验中,某同学将橡皮筋的一端固定于 P 点,用一只弹簧测力计将橡皮筋的另一端拉到 O 点,记下拉力 F 合 的大小和方向。 ( 1)改用两只弹簧测力计拉伸橡皮筋,记下两个分力,如图3.4.5(a)所示。请指出图中两处操作错误。 ( 2)纠正错误后,记下两分力 F 1 、 F 2 的大小和方向。如题 3.4.5(b)图所示,用力的图示法在纸上画出表示三个力的箭头,以表示 F 1 和 F 2 的线段为邻边作平行四边形,由图可得, F 1 和 F 2 的合力 F = N。 ( 3)在题图中,表示 F 合 的线段不在平行四边形的对角线上,上述实验误差产生的原因可能有哪些?(写出两个原因)
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参考答案：
举一反三
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
查看完整题目与答案
【单选题】电源电路中滤波的作用是（）
A.
将正弦波变方波
B.
将交流电变直流电
C.
将高频信号变成低频信号
D.
使脉动直流电压变为平滑的直流电压
查看完整题目与答案
【简答题】滤波的作用是将 直流电变为 直流电。
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate scientists
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
查看完整题目与答案
【单选题】直流稳压电源电路中,滤波的作用是()。
A.
降低电网电压的有效值.
B.
将交流变为直流.
C.
将整流后的脉动直流中的谐波分量滤掉，使波动变平滑.
D.
将较平缓的直流变为稳定的直流.
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几进大观园?
A.
二次
B.
三次
C.
四次
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几次进大观园
A.
1次
B.
2次
C.
3次
D.
4次
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate science
B.
science affects almost every aspect of our life
C.
scientists live in a specific substructure
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
science affects almost every aspect of our life
C.
scientists live in a specific subculture
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】铅中毒问题中,模型所涉及的变量为( ) .
A.
组织、血液、舌头
B.
组织、血液、骨头
C.
组织、血液
D.
血液、骨头
查看完整题目与答案
相关题目：
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
查看完整题目与答案
【单选题】电源电路中滤波的作用是（）
A.
将正弦波变方波
B.
将交流电变直流电
C.
将高频信号变成低频信号
D.
使脉动直流电压变为平滑的直流电压
查看完整题目与答案
【简答题】滤波的作用是将 直流电变为 直流电。
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate scientists
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
查看完整题目与答案
【单选题】直流稳压电源电路中,滤波的作用是()。
A.
降低电网电压的有效值.
B.
将交流变为直流.
C.
将整流后的脉动直流中的谐波分量滤掉，使波动变平滑.
D.
将较平缓的直流变为稳定的直流.
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几进大观园?
A.
二次
B.
三次
C.
四次
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几次进大观园
A.
1次
B.
2次
C.
3次
D.
4次
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate science
B.
science affects almost every aspect of our life
C.
scientists live in a specific substructure
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
science affects almost every aspect of our life
C.
scientists live in a specific subculture
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】铅中毒问题中,模型所涉及的变量为( ) .
A.
组织、血液、舌头
B.
组织、血液、骨头
C.
组织、血液
D.
血液、骨头
查看完整题目与答案
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