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What exactly is a kilogram-meter? - Physics Stack Exchange The kilogram-metre (or more often the kilogram-kilometre) is a unit of measurement indicating that 1 kg (lets assume of coal) has been moved 1 km (towards, for example, a power station) It's used by big freight companies, governments etc as one metric of how much hauling they're doing As you can imagine, they're often very concerned with CO $_ {2}$ emissions per kilogram-metre Wikipedia
Top spun up with string under tension problem [duplicate] Possible Duplicate: Homework about spinning top I have a top with an unknown mass It has a moment of inertia of 4 00 * 10^-7 kgm^2 a string is wrapped around the top and pulls it so that its t
g 应是 9. 8 N kg，还是 9. 8 m s²？ - 知乎 的回答。 这个问题的本质就是普通的单位换算 N k g = k g ⋅ m ⋅ s − 2 k g = m s 2 N kg=kg\cdot m\cdot s^ {-2} kg=m s^ {2} ，跟等效原理没有任何关系，也跟广义相对论没有任何关系。因为对于一个完全由牛顿引力理论描述而不遵循广义相对论的宇宙，在其中 9 8 N k g = 9 8 m s 2 9 8N kg=9 8m s^ {2} 仍然是成立的。
Unit of torque with radians? - Physics Stack Exchange OP wrote (v1): So the torque should not be measured in N⋅m but rad⋅N⋅m Would that then be completely consistent? No, that would not be consistent with the elementary definition of torque $\vec {\tau}=\vec {r} \times \vec {F}$ as a cross-product between a position vector $\vec {r}$ and a force vector $\vec {F}$ An angle in radians is the ratio between the length of a circle arc and its
What exactly is energy? - Physics Stack Exchange If matter is energy then matter is the ability to do work (which doesn't make any sense) and in my physics class I was taught that work is kgm^2 s^2 (which makes less sense if matter is energy) (sorry if the order was a bit strange, i'm trying to get my thoughts out)