Recent content by collegeconfid

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    Find the resistance of a wire after it is stretched

    Homework Statement A wire is lengthened to 1.25 times its original length by pulling it through a small hole. Find the resistance of the wire after it is stretched. Homework Equations resistance=(resistivity)(length)/(area) The Attempt at a Solution Umm..the reasoning behind this is that the...
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    Electric Potential: Solving for Center of Sphere

    Homework Statement What is the electric potential at the center of a uniformly charged sphere? Homework EquationsEd=-VThe Attempt at a Solution Integrate from infinity to the center of the sphere and be sure to account for the changing electric potential. I was told that the answer might be...
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    Electric Potential: V=-ED for Capacitors?

    Homework Statement Why is the change in the electric potential between two capacitors V=ED ? Homework Equations V=-ED The Attempt at a Solution Isn't the change in electric potential equal to the negative of the product of the electric field and displacement? So, why is it that...
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    Solve Change in Voltage: Why is V=ED?

    Homework Statement Why is the change in voltage between two capacitors V=ED ? Homework Equations V=-ED The Attempt at a Solution Isn't the change in voltage equal to the negative of the product of the electric field and displacement? So, why is it that for a capacitor the change in voltage is...
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    Charge on Ion After 10V Potential Difference: Calculate?

    If the values for the potential difference and kinetic energy seem irregular, it was because I made them up, realizing that they were not relevant to my question. any help would be much appreciated.
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    Charge on Ion After 10V Potential Difference: Calculate?

    Homework Statement An ion accelerated through a potential difference of 10V experiences an increase in kinetic energy of 7 J. Calculate the charge on the ion.Homework Equations U=qV -qV=WThe Attempt at a Solution My book says the charge is positive, but I think that the charge is suppose to be...
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    Work Done By the Electric Field

    Homework Statement How much work is required to bring a 3 C point charge from infinity to a point X. The change in electric potential from infinity to point X is -6 V. Homework Equations -QV=W The Attempt at a Solution The answer is -18 J. MY confusion is whether this is the work...
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    Does a Spring Move Upward or Downward When the Box Stops?

    Homework Statement A spring (in equilibrium) is attached to the top of a box that is moving at a constant speed vertically upward. However, if the box stops, does the spring go upward or downward? Homework Equations The Attempt at a Solution The spring goes downward because originally, the...
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    What is the atomic number of hydrogen?

    thanks so much for the help
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