# Group Exercises

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• 01/05 - (1): Introductions
• Get white marker board and collect group.
• Introductions
• Select recorder and reporter.
• Record three things that each member of your group has in common, but not obvious to me by looking. (For example, "We are all wearing jeans" would be readily apparent to me!)
• Record two thinges different about each member; again, preferably not classifications obvious by casual observation. "We all like different music" is a well-worn example to avoid.
• Brainstorm group name -- select one?
• Make brief report to class.
Results

• 01/05 (2): Electrical Resistance Heating
• Select recorder and reporter.
• List 10 household (or other) items that use resistance heating.
• Try to identify the 5 largest consumers of electricity on your list.
• Select 5 other items that you think the other group will not mention.
• Select group name if not yet done and time permits.
• Make brief report to class.
Results

• 01/05 (3): Electrical Power
• Estimate the cost of running a hairdryer for one hour.
Ans: at 6 cents per kilowatt-hour, it costs 9 cents to operate a 1500 W hairdryer for one hour.

• 01/07 (1): Batteries and Bulbs

• 01/07 (2): Battery Packaging
• Consider the different battery packages that are commonly available: AAA, AA, C, or D. Does the data on battery characteristics support the following hypothesis:
The energy content of a battery is proportional to its volume.
Results

• 01/12 (1): Resistance of a Cylinder
• Dependence of a cylinder of Play-Doh on diameter?
• Procedure
• Data: collected by groups from previous term
• Graph: R vs. Diameter
• Graph: R vs. Reciprocal Diameter
• Graph: R vs. Reciprocal Area
Result

• 01/12 (2): Battery Testers

• 01/14 (1): Simple Circuits
• Discussion of written responses to questions 1--12.
• Group presentations of homework problems.

• 01/14 (2): Classification of Solids
• Observe and test the four cylindrical samples provided.
• Try to identify as many physical attributes as possible
-- Be imaginative! I came up with about 10 different properties.
-- Included in each kit are several pieces of abrasive paper and a hard, steel bolt.
• Which classification categories would hold 2 each? which 3:1?
Discussion

• 01/14 (3): Addition of Hex Numbers
• Find the sum of BAD and 1CE by adding their binary equivalents.
Solution

• 01/21 (2): Internet Challenge:
• Pose 3 challenge areas and a specific question for each to serve as a test of the instructor's WebExplorer status.
Examples:
1. SPORTS: What is the legal curvature for a hockey stick blade in the NHL?
2. MUSIC: On the 1995 Phish Fall tour, how many times did they play the song "Timber Ho"?
3. ASTRONOMY: When is the next solar eclipse visible from Newark, DE?
• I will report back with the results next week!
You will be presented with a similar challenge next class meeting.

• 01/28 (1): Group Term Project

• 02/02 (1): Consider that the transistor had not been invented.
• Attempt to describe some personal events, at least one per group member, that would have prevented you from being here today (in class, alive) except that the transistor was indeed invented and miniaturized so successfully.
• Next time, we will consider the "down side" of transistors in our society...

• 02/02 (2): Consider that the transistor had not been invented.
• At the end of the previous class we considered the positive aspects of transistors; that is, how they helped you get to class. Now consider the "down side" of transistors in our society...
• Describe some negative aspects of our lives that might be avoided if the transistor had NOT been invented.

• 02/02 (3): Truth Tables
• Construct the truth table for the following combination of gates:

• What does this circuit accomplish? (One point to each member of group for correct truth table; please record names of those contributing.)