Clasifica las siguientes acciones entre trabajo positivo y negativo 1. Atrapar una bola
2.Levantar una bola
3.Estirar un resorte
4.El resorte vuelve a su estado original
5.Lanzar una bola

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?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and