Recent content by doodle
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Undergrad Four Clocks Problem: Find Time When All 4 Clocks are Same
You are absolutely correct. :) Btw, here's my take on the christmas tree problem... Let the blue, red and white balls be labelled A, B, C, respectively. Weigh A1+B1 against A2+C1. If A1+B1 == A2+C1, weigh A1 versus A2. If A1 > A2, then the heavier balls are A1, B2 and C1; otherwise, it is...- doodle
- Post #23
- Forum: General Math
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Undergrad Coin weightings with two irregular coins
I think I am able to get it in 4 weighings (but not less). The initial steps are as follows: Assuming that the coins are labelled 1 to 8, then the initial weighing is 12vs34. If 12=34, then the second weighing is 156vs278. Otherwise (whether 12>34 or 12<34), the second weighing is...- doodle
- Post #8
- Forum: General Math
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Undergrad What is the solution to the diagonal garden path problem?
Oops, it should have been: Remove the path (say of length x) from the garden, we have the area equation (55)(40) - x = \sqrt{x^2 - 40^2} (40) and that gives x = 66.67 yards.[/color]- doodle
- Post #13
- Forum: General Math
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Undergrad What is the solution to the diagonal garden path problem?
Answer is hidden. Remove the path (say of length x) from the garden, we have the area equation (55)(40) - x = 2 \sqrt{x^2 - 40^2} (40) and that gives x = 48.202 yards.[/color]- doodle
- Post #11
- Forum: General Math
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Fun Riddle: Solve the Clues to Discover the Mystery Object Ending in X
Hmm... how about paradox[/color]?- doodle
- Post #6
- Forum: Fun, Photos and Games
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High School Spot the Odd Ball: Weighing Challenge in 3 Chances
I am pretty positive the bolded part would not work.- doodle
- Post #13
- Forum: General Math
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High School Solve the Puzzle: Cover Bedroom with Two Carpets
Happy New Year to you too; yes, after much experimentation with 'staircase' cuts and with the initial assumption that the 8x1 is located at the center of the room.- doodle
- Post #10
- Forum: General Math
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High School Solve the Puzzle: Cover Bedroom with Two Carpets
Solution hidden below. As a hint, the 8x1 is placed exactly vertically at the center of the room. :) 1. Cut the 10x10 into 2 portions. [FONT="Courier New"]AAAAAAAAAB AAAAAAAAAB AAAABAAABB AAAABAAABB AAABBAABBB AAABBAABBB AABBBABBBB AABBBABBBB ABBBBBBBBB ABBBBBBBBB 2. For...- doodle
- Post #7
- Forum: General Math
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Undergrad Solving a Gambling Game: Average & Median Winnings
Answer is hidden. The probability of getting n heads and (N-n) tails in N toss is P(n) = \binom{N}{n} (0.5)^N and the corresponding multiplier of gamble is X(n) = (1.5)^n (0.6)^{N-n} = (0.6)^N (2.5)^n The mean of this measure is E{X} = \sum_{n=0}^N P(n) X(n) = (0.3)^N \sum_{n=0}^N...- doodle
- Post #7
- Forum: General Math
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MATLAB MATLAB: Using WavWrite to Create a Single Audio File
You could do this... xbuff = []; for k = 1:(the number of tones) x = (insert your function here); xbuff = [xbuff; x(:)]; end sound(xbuff,fs); wavwrite(xbuff,fs,bits,'audio.wav');- doodle
- Post #2
- Forum: MATLAB, Maple, Mathematica, LaTeX
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Finding Voltages at V1, V2, and V3 using Node Analysis
No mistakes alright.- doodle
- Post #2
- Forum: Engineering and Comp Sci Homework Help
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Finding impulse of a CT system
Express the convolution as an integral. Compare this integral with the problem statement and obtain a function of the form h(t-\lambda). It should not be too difficult then to determine h(t).- doodle
- Post #2
- Forum: Engineering and Comp Sci Homework Help
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Engineering Solve Simple RL Circuit: Find and Sketch y(t)
I think it is more of the latter, that the 2H inductor is not charged before t = 0. My reason for saying so is as follows: The voltage across the 2H is always 0V before the switch opens. Then Ldi/dt = 0, or in other words, there is no change in the current across this inductor, hence it remains...- doodle
- Post #2
- Forum: Engineering and Comp Sci Homework Help
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MATLAB Whats wrong with this matlab code?
Here's a screenshot...- doodle
- Post #7
- Forum: MATLAB, Maple, Mathematica, LaTeX