Suppose that you are conducting a study of individuals’ atti…

Suppose that you are conducting a study of individuals’ attitudes towards immigration. You solicit participation over social media (Facebook), and nearly 2,000 individuals respond as your family and friends share the link to your survey with their friends and family. Would this be a scientifically sound study of public opinion on immigration?

  A police car travels down a two-lane road at a constant s…

  A police car travels down a two-lane road at a constant speed of 100 mph, it siren emitting sound at a frequency of 600 Hz.  Ahead of the police car, Danica is traveling in the same direction at a speed of 80 mph.  What frequency does Danica hear? (Note:  1 mph = 0.447 m/s and vsound = 343 m/s)