Reading:

Cutnell and Johnson, 1.4 -- 1.9; Chapter 3.

Problems for Review:

Reviewing these problems gives you good exposure to this week's main topics, in practice. All solutions are posted on our website |http://www.cc.emory.edu/PHYSICS/Faculty/Benson/141/review.html|. Quantitative solutions are also in the Student Study Guide.

Conceptual:

MCAT review problems 3 and 4 (on website).

Quantitative:

Chapter 1, problems 11, 27, 41.
Chapter 3, problems 17, 25, 37, 47, 51.

Problems to Hand In:

Conceptual:

Use the following to answer questions 1--6:

A cannon is located on the edge of a cliff 100 m above a flat, sandy canyon floor. Three cannon balls are launched from the cannon with the same initial speed of 50 , but at different angles. The cannon balls are identical except for their color. A red ball is launched horizontally, a white ball is lauched at a angle above the horizontal, and a blue ball is launched at a angle above the horizontal.

In all questions you may ignore air resistance and the length of the cannon, unless otherwise stated.

1. About how long will it take the red cannon ball to strike the canyon floor?
   1. 3.5 seconds
   2. 4.5 seconds
   3. 5.5 seconds
   4. 6.0 seconds
   
   
2. Which of the following accurately describes the VERTICAL component, , of the initial velocity for each ball?
   1. , , .
   2. , , .
   3. , , .
   4. , , .
   
   
3. If it were possible to launch all three cannon balls simultaneously, in which order would they hit the ground?
   1. White, blue,red
   2. Blue, white, red
   3. Red, white, blue
   4. Red, blue, white
   
   
4. When the white cannon ball reaches its apex, the
   1. acceleration is zero and its velocity is not zero
   2. acceleration is zero and its speed is zero
   3. acceleration is not zero and its velocity is zero
   4. acceleration is not zero and its speed is not zero
   
   
5. Approximately how far above the canyon floor will the white ball be when it reaches its apex?
   1. 30 m
   2. 120 m
   3. 131 m
   4. 225 m
   
   
6. Suppose one measures the red cannonball's acceleration just after firing and just before impact. The acceleration just before impact is approximately
   1. zero
   2. the same as it was just after firing
   3. the same magnitude, but opposite direction as just after firing
   4. double the acceleration just after firing

Quantitative I:

Complete these end-of-chapter problems (not questions!) from your textbook, submitting only your final circled choice for an answer.

Chapter 1.

26a.

26b.

44a.

44b.

Chapter 3.

20.

22.

Quantitative II:

Complete these end-of-chapter problems (not questions!) from your textbook. For these, you are expected to fully write up your solution. Summarize what information and variables are given in the problem statement, then state what equations and approach can be used to find the answer requested. Provide any needed justification if the equation or approach is not universally valid. Derive the answer formally, being sure all your equalities have sensible left and right hand sides. Plug in numbers only in your last step. Show derivation of your units. Box your final answer, which should be in the form variable = number units (direction if needed), for a quantitative question.

Chapter 1: 40.
Chapter 3: 23.

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