1. Helicity indicates the orientations of the spin and translational momentum vectors . 2. :: : Right, the angular momentum vector has changed. 3. The Dirac quantum operator corresponds to the particle four-momentum vector . 4. The length of this momentum vector must be larger than m _ f. 5. The physics of twisting can be explained by looking at the components of the angular momentum vector . 6. There is in fact no way to define a global energy momentum vector in a general curved spacetime. 7. It can be seen that for any object, the coriolis force over it is proportional to its momentum vector . 8. This information together with the detected position of the neutron is used to construct the momentum vector of the neutrons. 9. In terms of a momentum vector , there is an angle between the axis of the rocket engine and the gas flow. 10. The angular momentum vectors of the two flywheels won't cancel-both will resist angular momentum changes of their respective systems.