Well, in physics, momentum is a vector, and it is a product between the mass of a particle and its velocity.
物理中，动量是矢量，它产生于,由粒子的质量与速度。
2
What will the angular momentumvector do?
角动量的矢量会怎样呢？
3
At any point, if the sun elevation or sun azimuth errors or the momentumvector error exceeds tolerances, the ACS will return to an appropriate mode in order to correct the problem.