MCAS 2017 Session 2 Printer Friendly Version

Open-Response Questions
• BE SURE TO ANSWER AND LABEL ALL PARTS OF THE QUESTION.
• If you do the work in your head, explain in writing how you did the work.

Refer to the following information for the next four questions.

 a. Determine the average speed of the object for the time interval 0−2 s. Show your calculations and include units in your answer.

 b. Describe how the speed of the object is changing as it passes through point S. Explain your answer.

 c. Identify the point (S, T, or U) at which the velocity of the object is equal to zero. Explain your answer.

 d. Determine the distance moved and the displacement of the object for the time interval 0−4 s. Explain your answer.

Refer to the following information for the next four questions.

 a. Calculate the period, T, of the beep. Show your calculations and include units in your answer.

 The sound of the beep travels through air at 340 m/s. b. Calculate the wavelength of the beep. Show your calculations and include units in your answer.

 The child presses the button and pushes the toy car away. The car moves 5 m before it stops. It continues to beep, even after it stops moving.   c. Describe what happens to the amplitude of the beep observed by the child as the car moves away from the child.

 d. When does the child hear a beep with a frequency lower than 500 Hz? Explain your answer.

Refer to the following information for the next four questions.

 a. Calculate the work performed by the winch to lift the trap. Show your calculations and include units in your answer.

 b. Calculate the power supplied by the winch to lift the trap. Show your calculations and include units in your answer.

 The winch then lifts a second trap.   c. Explain how the winch could perform the same amount of work but supply a greater amount of power when lifting the second trap.

 d. Explain how the winch could supply the same amount of power but perform a different amount of work when lifting the second trap.