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    Chemistry Classify each solid as a covalent, ionic, metallic, or molecular solid.

    1. Homework Statement As the title would lead you to believe I have to classify each solid as a covalent, ionic, metallic, or molecular solid. These are the given solids Calcium Fluoride Rhombic Sulfur Frozen Ethanol Pure Calcium 2. Homework Equations n / a 3. The...
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    Determine whether the series is convergent or divergent

    1. Homework Statement I have to find whether the following is Convergent or Divergent ∑ from n = 1 to infinity 2 / n(2n + 2)^(1/4) Actually it's the fourth root, this is just easier to write. 2. Homework Equations According to the front of the sheet it's a quiz on P-Series and Integral...
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    Computer Science Simple Animations

    1. Homework Statement Create a class called, ThreeObjectAnimation, that creates a graphic animation with three animation object. The ThreeObjectAnimation class should move three objects around the frame, either randomly, or following a fixed pattern. The movements should occur every 250...
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    Find the Current at a Certain Point

    Sorry about the Picture thing, so, if i have two batteries in the same loop, do i add together their voltage?
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    Find the Current at a Certain Point

    1. Homework Statement For the circuit in the diagram below, R1 = 34.0 Ω, R2 = 20.0 Ω, ε1 = 8.50 V, ε2 = 10.5 V and ε3 = 10.5 V are connected as shown in the figure. http://loncapa.physics.mun.ca/res/mun/cdeacon/capalibrary/Graphics/Gtype1021/A5Problem30.gif What is the value of current I1...
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    Chemistry Calorimetry Question Find Final Temp.

    1. Homework Statement 10.11g of CaO (molar mass = 56.08 g / mol) is dropped into a styrofoam coffee cup containing 157.0 g of H2O at 25.0ºC. If the following reaction occurs, calculate the final temperature of the water assuming that the cup acts as a perfect insulator. (Assume that the...
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    Magnetic Field in a Cylindrical Conductor

    Not to worry, i got the answer. I was using the wrong equation. For values of Magnetic Field inside the given radius the equation is B = µIr / 2πa^2 B = (4π x 10^-7)(2.17)(0.01245) / 2π(0.0249^2) B = 8.71e-6 T In case anyone else had the same or similar problems.
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    Magnetic Field in a Cylindrical Conductor

    1. Homework Statement A cylindrical conductor of radius R = 2.49 cm carries a current of I = 2.17 A along its length; this current is uniformly distributed throughout the cross-section of the conductor. Calculate the magnetic field midway along the radius of the wire (that is, at r = R/2)...
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    Using Boolean Algebra to Prove Equations

    1. Homework Statement There should be lines of some values to imply the "Not" form of them, however to make it easier, i'll just use the ¬ Symbol (a) Let x, y be elements of a Boolean algebra. Prove from the axioms that (x · y) + x = x. (b) Prove from the axioms of Boolean algebra that...
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    Magnitude of Electric Field from an Atom

    -1.67e-6 = [k(q) / r2] * [4πr2] -1.67e-6 / [4πr2] = [k(q) / r2] -1.67e-6[r2] / [4πr2] = k(q) -1.67e-6 / 4π = k(q) -1.33e-7 = k(q) q = -1.33e-7 / 8.99e9 q = -1.48e-17 N/C
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    Magnitude of Electric Field from an Atom

    Sure, but what will that do? Gauss's Law = EA = (3.16e11)(4π(6.5e-10)2) = 1.67e-6
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    Magnitude of Electric Field from an Atom

    1. Homework Statement The neutral neptunium atom has 93 electrons. What is the magnitude of its electric field at a distance of 6.5x10-10 m from the nucleus? Hint: The number of protons in a nucleus is equal to the number of electrons in the neutral atom. q = 1.6e-19 * 93 =...
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    Electric Field Between two Charges Equals 0

    I'm assuming that the 3 and the 2 that you're using are the charges? Then why not add the Negative to the two? or is it irrelevant in this case E3 = 3/(x)^2 E2 = 2/(x-d)^2 3.17 / x2 = 2.19 / (x - d)2 √(2.19 / 3.17) = (x - d) / x √(2.19 / 3.17) = (1) - (d / x) 0.8311 = 1 - (d / x)...
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    Electric Field Between two Charges Equals 0

    Where did you get the 0.4617 From? Everything else i can see.
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    Electric Field Between two Charges Equals 0

    q1 / q2 = (x - d)2 / (x)2 3.17 / -2.19 = (x - d)2 / (x)2 √[3.17 / -2.19 = (x - d)2 / (x)2] 1.20 = (x - d) / x 1.20x = x - d 1.20(0.0365) = (0.0365 - d) 0.0438 = 0.0365 - d -0.0438 = -0.0365 + d d = -0.0073 m => -0.73 cm Something like that then?
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    Electric Field Between two Charges Equals 0

    Alright, so we know that it's to the right, I don't see how this is helping solving the problem i have.
  17. H

    Electric Field Between two Charges Equals 0

    I mean, after doing Quadratic i ended up with two values, both where larger than 3.65 cm. That's what i mean when i said i have two points. It's to the right because we the field is going to the right. We were taught that you always imagine what a proton would do should it enter the field...
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    Electric Field Between two Charges Equals 0

    After i got an answer the two points where to the right of the two charges.
  19. H

    Electric Field Between two Charges Equals 0

    1. Homework Statement A 3.17 μC and a -2.19 μC charge are placed 3.65 cm apart. At what point along the line joining them is the electric field zero? Assume that the first charge is at the origin and the second charge is at +3.65 cm. 2. Homework Equations E = K(q) / r2 Ep = E1 + E2 0 =...
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    Finding the Net Charge of the Earth

    Gauss's Law = EA = (142) * (4πr2) = (142) * (4π(6,378,100)2) = (142) * (5.11e+14) = 7.26e+16 C θ = 180° for each ∆A => -1 (Basically means it's negative since electric field and ∆A are in complete opposite directions So Electric Field then is just a negative) Gauss's Law = q / E0 q = (-E * A...
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    Finding the Net Charge of the Earth

    Nevermind. I solved the problem.
  22. H

    Finding the Net Charge of the Earth

    1. Homework Statement The Earth is surrounded by an electric field, pointing inward at every point. Assume a magnitude of E = 142N/C near the surface. a) What is the net charge on the Earth? b) How many excess electrons per square meter on the Earth's surface does this correspond to...
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    Resolution refutation help

    1. Homework Statement (a) Give a resolution refutation of the following formula: (x ∨ y) ∧ (y ∨ ¬z ∨ ¬x) ∧ ¬x ∧ (¬y ∨ x) (b) Convert the formula into CNF and give a resolution refutation for it: x1 ∧ (x1 ↔ x2) ∧ (x2 ↔ x3) ∧ (x3 →¬ x1) 2. Homework Equations n/a 3. The...
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    Simple Logic Question of Converting or to and

    Re: Simple Logic Question of Converting "or" to "and" But it simple terms of symbols like "∧ and" "¬ not." What would be an equivalent for "or?" The Question i was given is. Rewrite the following formula using only ¬ and ∧ (that is, write an equivalent formula which does not have ∨,→,↔)...
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    Simple Logic Question of Converting or to and

    Simple Logic Question of Converting "or" to "and" 1. Homework Statement As the title would have you believe it's really just a basic question. I have to write (¬q <---> r) /\ (¬p \/ ¬r) ---> (p \/ ¬q) just using "¬'s" and "/\'s" i know how to change everything else, but i cannot, for the life...
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    Deriving Basic Physic Problem Using Calculus

    Acceleration??? Sorry, this really isn't clicking.
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    Deriving Basic Physic Problem Using Calculus

    Well, from what i can tell, it give you the speed at any given time. But if that's the case i don't have the time to solve B
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    Deriving Basic Physic Problem Using Calculus

    the relationship between a(t) and v(t), and v(t) and x(t) is that if you integrate a(t) you get v(t) and integrating v(t) gets x(t)
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    Deriving Basic Physic Problem Using Calculus

    1. Homework Statement At a distance of 45 meters from a traffic light, a car traveling 15 m/s is brought to a stop at a constant deceleration a) What is the value of Deceleration (-5m/s) b) How far has the car moved when its speed has been reduced to 3 m/s c) How many seconds would the...
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    Simplification of Logic

    1. Homework Statement Simplify the following compound statements (give a smallest formula equivalent to each of them). State which logical identities you used at each step (a) (p→q)↔(q→p) (b) ¬(p∧q)→(q→(p∨q)) 2. Homework Equations n/a 3. The Attempt at a Solution (a) ( p...
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