Saturday
May 25, 2013

# Posts by drwls

Total # Posts: 27198

Physics
Use the formula E.M.F. = L*B*V , where B = 0.075 Tesla (or N/amp*m) EMF = 0.88 Volts V = 4.2 m/s Solve for L L = 2.8 m

math
(2/7)*(2/7) = 4/49

Physics
0.5 m V^2 = 0.5*(1/m)*(mV)^2 Kinetic energy = ( 0.5)*(1/m)*(momentum)^2 1 = (1/m)*0.125 m = 0.125 kg

Math
a)choose a variable to represent the number of coupons. Let's choose N b)Write an Algebraic expression that describes the amount Winnie paid for the box of DVDs. Let C be the amount paid. C = 56 - 3N c)use your expression to calculate how much Winnie would pay if she had 5...

physics 11
Let westward velocity be positive and eastward velocity be negative. Use conservation of momentum. 4*25 = 4*(-8) + 15 V Solve for V V = 132/15 m/s

Physics
From the original beat frequency of 3 Hz, you know that the "other" fork has a frequency of either 507 or 513 Hz. If you lower the frequency of the 510 Hz fork and get a higher beat frequency, the "other" fork must have the higher 513 Hz frequency, NOT 507.

physics
A pipe closed at one end has a fundamental wavelength equal to four times the pipe length. That would be 336 cm. or 3.36 m. Divide the speed of sound by that wavelength to get the frequency.

linear algebra
I see more equations (5) than unknowns (4). The problem could be overdetermined. The last equation is a simple combination of the third and fourth. So there is a solution, but you don't need the x − 6y + 3z = 1 equation to get it. For more about Gauss Jordan, see htt...

Math
It depends upon the state. Some states to not require the purchaser to pay sales tax on the entire selling price if a similar vehicel is traded in. For example, see (for Ohio) http://www.brunercox.com/ohio-sales-tax-trade-in-allowance/ You have not said what the applicable sal...

physics
No. of laps completed by Adam in time t (in seconds) = Na = t/50 No. of laps completed by Grampy in time t = Ng = t/90 Gramps will be "lapped" when one lap behind Adam Na = Ng + 1 t/50 = t/90 + 1 90t/4500 = 50t/4500 +1 40t/4500 = 1 t = 112.5 seconds Na = 2.25 laps Ng...

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