PhysicsLAB MCAS Physics Exams
MCAS 2019 Session 1

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Open-Response Questions
  • BE SURE TO ANSWER AND LABEL ALL PARTS OF THE QUESTION.
  • Show all your work (diagrams, tables, or computations) in your Student Answer Booklet.
  • If you do the work in your head, explain in writing how you did the work.
 
 
Refer to the following information for the next three questions.

The diagram below represents one type of wave created on a guitar string when the string is plucked. The string has a length of 0.65 m and vibrates at a frequency of 880 Hz.
 
a. In your Student Answer Booklet, copy the wave diagram and label the wavelength of the wave.
 
 

b. Calculate the velocity of this wave on the string. Show your calculations and include units in your answer.
 
 

The wave on the guitar string also creates sound waves in the air. The speed of the sound waves is 340 m/s in air. The pitch created by the guitar string matches the pitch heard by an observer.
 
c. Compare the frequency and wavelength of the wave on the guitar string to the frequency and wavelength of the sound wave in the air.
 

Refer to the following information for the next four questions.

a. Using the data for person 1, calculate the speed of the walkway. Show your calculations and include units in your answer.
 
 

Stepping onto the walkway, person 1 accelerates from an initial speed of 0 m/s to the speed of the walkway in 0.6 s.
 
b. Calculate the acceleration of person 1. Show your calculations and include units in your answer.
 
 

c. Calculate the net force that accelerated person 1. Show your calculations and include units in your answer.
 
 

Person 1 and person 2 have the same acceleration as they step onto the moving walkway.
 
d. Identify whether the net force acting on person 1 is greater than, less than, or equal to the net force acting on person 2. Explain your answer.
 
 




 
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