distinguish between theoretical mechanical advantage and actual mechanical advantage. How would these compare if a machine were 100% efficient?

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow

If a star is moving toward earth, it is