MCAS Physics Exams MCAS 2007 Session 2
A 600 g basketball, a 57 g tennis ball, a 46 g golf ball, and a 2.7 g table tennis ball are moving with the same velocity. Which ball has the greatest momentum?

Which of the following is a main factor that affects the speed of a wave?

Which of the following graphs best represents the relationship of the frequency of an electromagnetic wave to its wavelength?
The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?

Which of the following waves travels fastest?

The diagram below shows a hammer about to strike a moveable piston.

As the piston moves suddenly when struck, which type of wave pulse is generated in the air inside the cylinder?
How long will it take a car to accelerate from 20 m/s to 26 m/s at a rate of 1.4 m/s2?
Which of the following can carry light waves but not sound waves?
A crane lifts two 100 kg loads of building materials to the top of a building under construction. The first load is lifted in 10 s and the second load is lifted in 13 s.
Which of the following statements best compares the work and power expended by the crane lifting the two loads?

The graph below relates velocity to time.

The graph would most likely apply to which of the following events?

Which of the following waves can travel at a speed of 3 x 108 m/s?
The diagram below shows an electrical circuit.

Which of the following best explains why energy stored in the battery power source diminishes over time when this circuit is complete?

A 9 kg model airplane flies horizontally at a constant speed. If the plane suddenly dives from its altitude of 50 m and levels off at 20 m, how much potential energy does it lose in the dive?
Ultraviolet light has a shorter wavelength than visible light. Which of the following is another way ultraviolet light can be compared to visible light?

To calculate the momentum of a pickup truck with a velocity of 25 m/s east, it is also necessary to know which of the following?

The diagram below represents two identical space ships, Earth, a space station, and the Moon.

The two ships are launched toward the Moon. Ship 1 is launched from Earth, and ship 2 is launched from the space station. It takes less force to launch ship 2. Which of the following contributes most to the difference in the forces?

A sealed glass container holds molecules of nitrogen gas. The nitrogen molecules have increasing velocities. Which of the following will make the molecules move faster?

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.

In an experiment, the current is varied as it goes through the resistor in a circuit. An ammeter measures the current going through the resistor and a voltmeter measures the voltage across the resistor. The data are recorded and shown below.

 a. Using the data in the table, make a graph of the voltage versus the current in the circuit. Voltage should be on the y-axis. Make sure the graph has clearly labeled axes and a proper scale.

 b. Find the slope of the graphed line. Show your calculations and include units in your answer.

 c. Explain what the slope represents.

Refer to the following information for the next three questions.

A book is on a table. A student pushes it for a short time. Initially the book moves, but then it comes to a complete stop.

 a. Identify the forces acting on the book before it is pushed. You may include a labeled diagram in your answer.

 b. Explain why the book moves and then comes to a complete stop. Use the laws of physics in your answer.

 c. The student wants the book to move at a constant speed in one direction. Describe the physical conditions needed for this to occur.