you are a trace evidence technician examining a fragment of clear material recovered from a recent crime scene. As you examine the material, you observe birefringence (double refraction). is this material a type of glass

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.