Recent content by GlobalDuty

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    High School What's the Probability of Finding Cake in the Last Box?

    o ok, thanks for the responses. the problem was bad to begin with.
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    High School What's the Probability of Finding Cake in the Last Box?

    yeah, this is bothering me the wording is bad, but its not a trick question. i guess better wording would be: what's the probability that you open all the boxes and then find cake in the last one?
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    High School What's the Probability of Finding Cake in the Last Box?

    you open box after box until you get the cake. what's the probability that after opening 4 empty boxes, you open the last box with cake? i know that the probability of finding cake in the first box is 1/5. i think for the 5th box you multiply: (1/5)(1/4)(1/3)(1/2) to get the answer. is this right?
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    Undergrad What is the result of dividing log(log x) by log x?

    what is: [log(log x)] / [log x]i would guess logx/1 but not sure
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    High School Simplify (a+b)^c | No Squareroot Needed

    it doesn't have to be simpler, just not so complicated. thanks CRGreathouse, that helps,
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    High School Simplify (a+b)^c | No Squareroot Needed

    what is another way to form (a+b)^c to another simple expression? like for example a^c+b^c doesn't work because its not eqivalent to (a+b)^c (without using squareroot)
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    Circuit Currents and Kirchoff's Rules: Explaining a Tricky Homework Problem

    Homework Statement The Question is number 18 in this link: http://www.sewanee.edu/physics/PHYSICS102/Ch28.pdf The Attempt at a Solution I Used X,Y,Z for currents. X for the segment straight down the middle. Y for the bottom to top segment on the left Z for the bottom to top segment on the...
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    [Circuit] Potential Difference question

    thank you for the explanation
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    [Circuit] Potential Difference question

    still confused. do you mean i just multiply (Current1)*(20 Ohms) = Vb (Current 2) *(10 ohms) = Va and then Va - Vb?
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    [Circuit] Potential Difference question

    Homework Statement http://www.sewanee.edu/physics/PHYSICS102/Ch28.pdf It is number 18 in the link. The Attempt at a Solution I found the three currents but i don't know how to find the Potential Difference between two points. what formula am i supposed to use?
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    What Determines the Acceleration of a Charge in an Electric Field?

    Homework Statement When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a distance r away from q, the acceleration of q is a. in the direction of the charge Q1 or Q2 of smaller magnitude. b. in the direction of the charge Q1 or Q2 of greater magnitude...
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    Work on Electricity (is this right?)

    Homework Statement Four identical point charges (+4.0 mC) are placed at the corners of a square which has 20-cm sides. How much work is required to assemble this charge arrangement starting with each of the charges a very large distance from any of the other charges?The Attempt at a Solution I...
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    Calculating Cost of Operating Lamp

    yeah i divided by 1000 at the end, but .3 is wrong
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    Calculating Cost of Operating Lamp

    Homework Statement Compute the cost per day of operating a lamp that draws a current of 1.90 A from a 110 V line. Assume the cost of energy from the power company is $0.0620 / kWh. NOTE: Enter your response with tenths precision. The Attempt at a Solution 1.90*110V*.0620*24 = .310992...
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    Is There an Equation for Velocity?

    Does anyone know if there exists an equation for finding final velocity by just knowing: 1) Time, 2)final and initial position and 3)constant acceleartion?