有两个互成1200共点力,大小均为20N,其合力的大小为 A.5N      

有两个互成1200共点力,大小均为20N,其合力的大小为

A5N       

B20N      

C25N        

D30N

答案

B

相关题目

新民主主义革命是“新式的特殊的资产阶级民主革命”,它
新民主主义革命是“新式的特殊的资产阶级民主革命”,它的基本特点有   ①它有新的革命性质即社会主义革命的性质 ②它有新的领导阶级即无产阶
   A few months ago the potato was considered an enemy in the obesity battle
   A few months ago the potato was considered an enemy in the obesity battle but a new study shows the food isn’t that bad after all. In June, researchers from Harvard University found that ea
已知双曲线的离心率为2,若抛物线的焦点到双曲线的渐近线
已知双曲线的离心率为2,若抛物线的焦点到双曲线的渐近线的距离为2,则抛物线的方程为                     ()    A.      B.    C.  
For quite        students, their teacher’s advice is more important tha
For quite        students, their teacher’s advice is more important than      of their parents. A.few; one        B.a few; that          C.a little; some       
已知二次函数y1=x2-x-2和一次函数y2=x+1的两个交点分别为A(-1,0
已知二次函数y1=x2-x-2和一次函数y2=x+1的两个交点分别为A(-1,0),B(3,4),当y1>y1时,自变量x的取值范围是(    ) A.  x <-1或x>3        B.-1<x<3
Frankly, I very much appreciate myself. Yes, I admit I’m in many respects not
Frankly, I very much appreciate myself. Yes, I admit I’m in many respects not as good as other people, but I don’t think I’m always not good. When I find what I’ve done or written is okay, I
阅读下面的材料,按要求作文。 仰望,从某种意义上说是一
阅读下面的材料,按要求作文。 仰望,从某种意义上说是一种精神上昂的生存姿态,它使生命战栗、贯注、凝神……仰望,就是漫漫黑夜中的灵魂追寻
手握一根水平绳的一端上下抖动,在t时刻绳上呈现的波形如
手握一根水平绳的一端上下抖动,在t时刻绳上呈现的波形如图12-1-3所示.如果绳上C点此时的速度是向下的,则人手握住的是绳子的__________端.若人手握住

最新题目