a cross section of a parabolic reflector as shown below. a bulb is located at the focus the opening at the focus AB is 12cm what is the diameter of the opening CD 8cm from the vertex?

Ascientist is tracking an object orbiting the sun that is found between mars and jupiter. in order to classify the object as an asteroid, it must be at least

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line