Some thermal containers have layers of materials to keep drinks cold for as long as possible. Which design would help keep ice frozen for the longest period?​

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

What are two different ways you could find the value of a? explain these methods.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?