What is the best description of the destructive interference of light?

a. a longitudinal wave meets transverse light wave
b. two waves have the same direction of displacement
c. a mechanical wave meets an electromagnetic wave
d. two waves have displacement in opposite directions

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Apatient has a history of poor nutrition. he has skin rashes, bleeding gums, and a cut that hasn’t healed in a long time. what vitamin deficiency most likely caused this symptom?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.