Open Response Section

You must answer two of the questions posed below. Each question is worth 10 points. Be sure to include as much detail as possible. Short, unexplained answers will receive little credit. These must be turned in tomorrow, or completed on the wikispace by 10 pm Thursday, June 10th.

Please answer the questions on a separate sheet of paper, or on the Q4 Exam page form of the wikispace (pwhphys.wikispaces.com)

Please be sure to indicate the number of the question you are answering at the top of your page, or in the answer box of the wiki. Please also list any references you use to answer the question. You do not need to restate the question.

1. An object is dropped from the top of a building. It takes 4 seconds to hit the ground. Explain how you would use the problem solving method in order to find out how high the building is. Then, solve the problem using an equation of motion.

2. Many say our national and global societies are at a crossroads. We have to decide how to change the way we produce and consume energy. Why do we say this, and how might we go about doing it?

3. Please give some examples of inverse square laws that occur in nature, and explain why so many different phenomena that behave like this can be well described by essentially the same equation.

4. Please describe the electromagnetic spectrum. Be sure to include information on energy and how humans are affected by and/or use the different regions of the spectrum.

5. Please describe what you know about nuclear reactions. Be sure to compare fusion to fission and nuclear reactors with nuclear explosions.

6. Please describe in detail how the ear and the eye work. Explain how we can protect these organs, and why it is important for us to do so.