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HowCam committed Jan 18, 2025
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2 changes: 1 addition & 1 deletion docs/physics/junior/U1.md
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- 初学者在草稿本上计算时,应注意「单位参加运算」的原则。可以通过「数值算数值,单位算单位」的方式来分开计算。这样可以起到验证代值是否正确的作用。
- 在书写单位的时候,应注意单位的书写方法。
- 习惯上,超过 $1000$ 的数值通常使用科学计数法书写。在使用科学计数法书写数值时,通常应遵守科学计数法的书写规范(即在 $a \times 10^b$ 中,$1 \le a < 10$)。但也有例外情况,比如在书写密度的数值时,可以写成 $n \times 10^3$ 的形式。
- 在物理计算题中,只有叉乘和省略乘号是被允许的。数值和数值间用叉乘,符号和符号间可省略乘号。点乘($A \cdot B$ 或 $a \cdot b$)不被允许。例如:$s = vt = 30 \ m/s \times 180 \ s = 5.4 \times 10 ^3 \ m$。
- 在物理计算题中,只有叉乘和省略乘号是被允许的。数值和数值间用叉乘,符号和符号间可省略乘号。点乘($A \cdot B$ 或 $a \cdot b$)不被允许。例如:$s = vt = 30 \ m/s \times 180 \ s$$= 5.4 \times 10 ^3 \ m$。

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9 changes: 9 additions & 0 deletions docs/physics/senior/U1.md
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确定地球表面物体位置常用的坐标系是经纬度,它是固定在地球表面上的二维坐标系。海面上航行的轮船和陆地上行驶的汽车,用 经纬度就可准确地定位。而在空中飞行的飞机,要准确地描述其位置,除了经纬度以外,还需要高度的数值,这就是一种空间的三维坐标系。

??? note "示例"

<img src="https://pic1.imgdb.cn/item/6789ad69d0e0a243d4f50323.jpg" alt="1-2-5" style="zoom:50%;" />

<img src="https://pic1.imgdb.cn/item/6789ad6fd0e0a243d4f50332.jpg" alt="1-2-5" style="zoom:50%;" />

初中数学所学的平面直角坐标系就是最常用的一种二维坐标系

### U1-2-2 位移

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