MCAS 2012 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 three questions.

 a.  Identify whether audio only, video only, or both audio and video of the fireworks will be recorded by each camera.

 b.  Explain each of your answers for part (a). Suppose a camera records both audio and video.

 c.  Will the light or the sound from the fireworks be recorded first? Explain your answer.

Refer to the following information for the next three questions.

 a.  Construct a free-body force diagram that represents the forces acting on the box when it is 1.0 m above the floor. Be sure to label your diagram.

 b.  Explain how you know that work is being done on the box, and how the work results in a change in the energy of the box.

 c.  Calculate the amount of work done on the box and the change in potential energy of the box. Show your calculations and include units in your answer.

Refer to the following information for the next three questions.

 a. Describe what happens to the temperature of the can of juice and the temperature of the water in the container within the first few minutes after the can is submerged. Explain your answer.

 b. After four hours, will the can and the water have the same temperature or different temperatures? Explain your answer.

 c. Estimate the numerical value(s) of the final temperatures of the can of juice and the water after four hours. Explain your answer.