Donald Ellis @MathADon
University professor in electrical engineering. Hobbyist in programming (C/C++, MATLAB, Julia), data science, ham radio, music, and baseball. Phoenix, Arizona USA Joined November 2008-
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EE/Math problem of the day (3/18/18): A bipolar music waveform with peak voltages +- 2.5 V will be encoded in binary computer bits, where each code represents a 20 mV signal span. How many bits will we need to encode this signal?
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Just changed my Twitter name to Log2Don (from MathADon). A few years ago I was tweeting math problems for fun, maybe I'll try that again. But now not only math, but electrical engineering as well.
Donald Ellis retweeted
Long-time SciAm math columnist Martin Gardner died peacefully today, per James Randi, @jref. Randi's reflections: http://ow.ly/1ODo6
Donald Ellis retweeted
Today's date (01.02.2010) is a palindrome of numbers! It reads the same forward and backward :)
Donald Ellis retweeted
Holiday Tweet-a-Day time: A look at 2010! http://bit.ly/5OOWQO RT to win!
Science problem for 11/25: Water decomposes into 8 parts oxygen, 1 part hydrogen by mass. Why then is the formula for water H2O, not HO8?
Math problem for 11/25: Perpendicular lines have negative reciprocal slopes. If a line has slope 2/3, what's the slope of its perpendicular?
Answer to 11/12 science problem: When atoms emit particles from their nucleus, it's called radioactivity. Radioactivity can be dangerous.
Answer to 11/12 math problem: A circle is inscribed inside a square, the ratio of their areas is (pi r^2) / (2 r)^2 = pi / 4 or about 0.79.
Science problem for 11/12: When atoms emit electrons it's electric current. What's it called when atoms emit particles from the nucleus?
Math problem for 11/12: A circle is inscribed inside a square. What's the ratio of the circle's area to the square's area?
Answer to 11/9 science problem: In this case, the gravity force is same as the universal gravity constant G = 6.67 x 10^(-11) in newtons.
Answer to 11/9 math problem: It's a trick. Two circles touch at one point, but they might not be in the same plane! So 0 < d < 2r.
Math problem for 11/7: Two circles of radius 1 touch at a single point. What is the distance between their centers? Hint: maybe a trick!
Science problem for 11/9: Two large plastic spheres of mass 1 kg and diameter 1 meter are touching. What is their gravity attraction force?
Answer to 11/7 science problem: Standing in a vacuum chamber, you can't hear anything because sound needs something like air to travel in.
Answer to 11/7 math problem: First find the sum of all angles in a pentagon = (5 - 2) x 180 = 540. Then divide by 5 to get each angle = 108.
RT @timoreilly: Fascinating article about math in the Soviet Union, Russia, and the U.S. http://bit.ly/1GrEy2
Math problem for 11/7: Each angle in an eqilateral triangle is 60 degrees, and in a square is 90 degrees. What's each angle in a pentagon?
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