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JiTT Exercises
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Please Note: It may not always be possible to include the necessary special characters, superscripts, subscripts, etc. in e-mail responses to this group of exercises. We suggest that you discuss this matter with your professor/class and decide upon a system for indicating such characters. You may cut/paste some characters and/or Greek letters from Microsoft Word, using the Insert menu. Alternatively, we suggest that you agree upon abbreviations for or spell out symbols, Greek letters, or characters and indicate superscripts and subscripts by using "sup", "sub", or up/down carats.

1
A student's lab report concludes, "The speed of sound in air is 327." What is wrong with that statement?
2
Write these numbers in scientific notation: (a) the U.S. population, 250000000; (b) the diameter of a Helium nucleus, 0.000000000000003 8 m.
3
You are given these approximate measurements: (a) the radius of Earth is 6 × 106 m, (b) the length of a human body is 6 feet, (c) a cell's diameter is 10-6 m, (d) the width of the hemoglobin molecule is 3 × 10-9 m, and (e) the distance between two atoms (carbon and nitrogen) is 3 × 10-10 m. Write these measurements in the simplest possible metric prefix forms (in either nm, Mm, µm, or whatever works best).
4
A linear plot of speed versus elapsed time has a slope of 6.0 m/s2 and a "y" intercept of 3.0 m/s. (a) What is the change in speed in the time interval between 4.0 seconds and 6.0 seconds? (b) What is the speed when the elapsed time is equal to 5.0 seconds?
5
A poster advertising a student election candidate is too large according to the election rules. The candidate is told she must reduce the length and width of the poster by 20.0%. By what percentage will the area of the poster be reduced?
6
For what radius, if any, does the area of a circle equal the circumference of the circle? Explain.







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