Recent content by J89

Homework Statement In the ground state of hydrogen, the uncertainty in the position of the electron is roughly 0.10 nm. If the speed of the electron is approximately the same as the uncertainty in its speed, about how fast is it moving? Homework Equations h/(4pi*m*v) = h=6.63e-34...

Homework Statement You will need to know the spacing d between grooves on the diffraction grating used in the lab. If the this diffraction grating has 13400 grooves per inch, how many grooves per meter does it have? Homework Equations 1 inch = 39.37 meters The Attempt at a...

Homework Statement A copper wire is 9.00 m long and has a cross-sectional area of 1.00 10-4 m2. This wire forms a one turn loop in the shape of a square and is then connected to a battery that applies a potential difference of 0.100 V. If the loop is placed in a uniform magnetic field of...

Homework Statement A dead battery is charged by connecting it to the live battery of another car with jumper cables. Assume that V = 5.5 V and R = 0.50 . What is the current of the starter and the current of the dead battery? Homework Equations I=V/R, I1=I2+I3, basically Kirchoff's...

The length is right. I know my diameter is wrong because everytime I put it in the homework box, it keeps marking it wrong, and I think this is the correct way to do it..I did a similar problem to this one, and that was marked right..don't know, what I am doing wrong for the diameter..can...

The resistivity of copper is 1.7e-8. The resistance is .600 ohms. The volume of copper is 1.12e-7 (1 kg copper/density of copper) = 1e-3/8.92e3 = 1.12e-7. So.. I/A = R/P = .600/(1.7e-8) = 3.53e7 m..then multiply it by the volume of copper = 3.53e7 * (1.12e-7) = 3.9525 and then take...

Homework Statement Suppose that you wish to fabricate a uniform wire out of 1.00 g of copper. Assume the wire has a resistance R = 0.600 , and all of the copper is used. What will be the diameter of the wire? Homework Equations A = V/l R = sqrt(A/pi) The Attempt at a...

Homework Statement Your lab partner is opening and closing the tap switch to turn on and off the voltage from a battery. If you see the following trace on the screen and the VOLTS/DIV knob is set to 0.5 V and the TIME/DIV dial is set to 2s/DIV, you can tell that the voltage of the battery is...

Homework Statement If 3.00 10-3 kg of gold is deposited on the negative electrode of an electrolytic cell in a period of 2.62 h, what is the current in the cell during that period? Assume the gold ions carry one elementary unit of positive charge. Homework Equations delta Q/delta T...

Homework Statement Three charges are at the corners of an equilateral triangle, as shown in the figure below. Calculate the electric field at a point midway between the two charges on the x-axis. Magnitude: Direction below the x-axis in degrees. Homework Equations F=Ke*q/(h)^2...

it is supposed to be .20, sorry, but thanks :)

Homework Statement Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction of the net electric force on the 0.40 µC charge. (A = 0.20 µC, B = 6.60 µC, and C = -3.80 µC.). Diagram below... Homework Equations F=...

It's asking to find vector force that particle A exerts on B..so just to get a head start, I assume you would just plug it into the formula... F = Ke |q1|/r^2 when it is rearranged, I assume you would multiply the charge by the original length and divide by the new length when it was...

F = force Ke=Couloumb's constant = 8.99*10^9 r=distance in meters q1 and q2 stands for the charge..

Homework Statement Suppose 7.00 g of hydrogen is separated into electrons and protons. Suppose also the protons are placed at the Earth's North Pole and the electrons are placed at the South Pole. What is the resulting compressional force on the Earth? Homework Equations Fe =...