Question

xc

這是物理題目，算功
有人可以解釋一下這個式子是甚麼意思嗎？
尤其是下面那一行

J
0
object as the object moves in the x direction from the origin to x=5.00 m. Find the
work W = JF. dr done by the force on the object.
第 29 題詳解:
5m
P6.29 W = [ F ·dř = [ (4xî + 3yĵ)N · dxî
W
5 m
(4
0 - (4 N/m)
(4 N/m)xdx + 0=(4N/m)-
ASUS
X
O
5 m
50.0 J
23°C 多雲

Answer 1

阿貓

x,y座標平面上之單位向量為I,j
且向量I,j互相垂直
i.i 內積值=1；i.j 內積值=0