Format for solving the Weekly Physics Problem:
Use word processing, spreadsheet...
Remember Friday Problems are an individual project, you should NOT be
consulting with anyone except the teacher!

- Step 1. DESCRIBE the problem Explore the problem with words and with diagram(s). Show that you understand what is given, what assumptions are made, and what you do not need. Describe the problem in your own words such that you show that YOU understand the conditions of the problem.
- Step 2. PLAN your solution Explain the plan in words. Refer to whatever skills and/or equations you are going to use to solve the problem. Show that you understand the kinds of knowledge that will be useful in solving the problem.
- Step 3. SOLVE the problem Implement the solution to the problem. Place the numerical values into the appropriate relationships and produce the final answer. Show these steps with the proper symbols.
- Step 4. CHECK the solution Use a different mechanism to check your problem. The simple "makes sense" mode is not enough generally to check your logic, neither is simply using the same formula and working backwards which checks only your arithmetic skills.
- Step 5. EXTEND the problem Write a new part to the problem. Based on the information given or assume a new piece of information, invent a new problem that goes with the one given.

All Friday Problems are due at 8 am on Friday and are to be done following the format given to you and word processed. Please remember they are an individual activity, NOT a group project.

- Estimate the speed of 32 grams oxygen molecules at room
conditions
(20¡C and 102000 N/m2) occupying 0.024 m3.
- The same volume of .002 kg of hydrogen under the same conditions.
- From your answer to a, estimate the average speed of nitrogen in the
same conditions.
- What is the speed for oxygen if the pressure is doubled?

You are riding on an elevator on the way to your eighteenth floor apartment. The elevator is accelerating upwards at 5.40 m/s/s. Beside you is the box containing your new TV set, box and contents that have a mass of 36.0 kg. While the elevator is accelerating upwards, you push horizontally on the box to slide it at a constant speed toward the elevator door. If the coefficient of kinetic friction between the box and the floor is 0.34, what magnitude of force must you apply? (Draw a force diagram)

This work will replace your Friday Problem this week. The GOAL of this project is for you to design and build a balanced hanging mobile using the physical relationships of a system in Equilibrium .

You will, individually, build a mobile that will consist of at least 3 levels and at least 3 objects. Only one of the hanging objects may be symmetrical. All others must not have their center of gravity at their center of their geometry. The more interestingly they are hung the better.

Choose objects that of interest to you. Because various religious and secular holidays are approaching, you may wish to choose one of those themes.

The mobile is due on _________________ Also due is a paper showing calculations done to determine or to illustrate the BALANCED hanging positions.

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