 MCAS 2018 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. Describe the direction of heat flow between the cups of water in the first few minutes of the investigation.

 b. Identify the primary method of heat transfer (conduction, convection, radiation) between the cups of water. Describe how the transfer of heat occurred for the method you identified.

 c. After 25 minutes, the water in both cups reaches thermal equilibrium. Explain how the student can determine that thermal equilibrium has been reached between the cups.

 d. On the grid in your Student Answer Booklet, copy the title, axes, and labels of the graph, as shown below. Draw two curves, one to represent the temperature of the water in cup 1 and the other to represent the temperature of the water in cup 2, over a 30-minute period. Assume no heat is lost to the surroundings. Refer to the following information for the next four questions. a. Compare the amount of force needed to start the bookcase moving to the amount of force needed to keep it moving at a constant speed.

 b. On the grid in your Student Answer Booklet, copy the free-body force diagram. Add to your diagram the horizontal forces acting on the bookcase when it is pushed at a constant speed. Include labels and use the grid squares to represent the relative magnitude of each force acting on the bookcase.

 c. Identify one change to the bookcase or the floor that would affect the amount of force required to move the bookcase.

 d. Explain how the change you identified in part (c) affects the amount of force required to start the bookcase moving or to keep it moving.

Refer to the following information for the next four questions. a. Identify a different circuit component that could serve the same purpose as the solar panel in this circuit.

 b. Calculate the current in the student’s circuit. Show your calculations and include units in your answer.

 c. Calculate the power produced by the student’s circuit. Show your calculations and include units in your answer.

 d. Describe one way the student can modify the circuit to increase the current through the resistor. Related Documents