A ambulance travels down a highway at a constant speed of 55 mph, it siren emitting sound at a frequency of 500 Hz.  Ahead of the ambulance, a truck is traveling in the same direction at a speed of 75 mph.  What frequency does truck driver hear? (Note:  1 mph = 0.447 m/s and vsound = 343 m/s.  Select closest answer)

      A laser enters a coating that consists of a layer of saffire on top of glass. With the shown angle of incidence from the air into the saffire,  what is the angle of refraction into the glass?  (select closest answer)

Use the reaction and picture below to select the word from each drop down menu that make the statement entirely correct.  (Kc = 0.067, solvent water molecules are not shown in the picture) Unit2_quiz_Q_question.png The reaction mixture illustrated above [BLANK-1] at equilibrium and therefore it will proceed in [BLANK-2] direction.

Use the table below to fill in the blanks with the correct answers: Unit2_quiz_graphics2_small.jpg The value of Keq for the overall reaction (A⇄D) = [BLANK-1]   (express your answer with 3 Sig Fig’s) The compound present in the highest concentration when the mixture reaches equilibrium is [BLANK-2] (type in A, B, C, or D)

What force keeps planets in orbit around the Sun?

[x]+[y]*[z]

  [x]+18

Which of the following statements is an example of a theory?

David Fogel’s justice model is based on the idea that ________.

Atavism implies that criminals ________.