Page 1 Page 2 Page 3 Page 4 Kinetics velocity: $\mathbf{v}=\frac{d\mathbf{r}}{dt}=r'_x \mathbf{i}+r'_y \mathbf{j}+r'_z \mathbf{k}$ acceleration: $\mat阅读全文
In mechanics, switching reference frames is a prevalent way to simplify questions, as long as it becomes easier. Centre-of-momentum reference frame,…
We have discovered how gravitational fields work and some facts about them, today we continue to expand the theories that…
Initially, Gauss investigated the pattern of gravity and developed "Gauss' law for gravity" but unexpectedly it turned out to be…