Một chất điểm chuyển động theo quỹ đạo tròn bán kính r, vận tốc v. Nếu tốc độ của nó tăng lên 2v trên cùng quỹ đạo tròn đó. Hỏi gia tốc hướng tâm của nó tăng lên bao nhiêu lần

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

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.