Recent content by ajmCane22

I don't understand. I'm not calculating velocity? I'm calculating kinetic energy in Joules and converting it to eV. Where do c and v come in?

Homework Statement (a) Find the kinetic energy of an electron whose de Broglie wavelength is equal to 0.63 Å, a typical atomic size. Ke = 379 eV (b) Repeat part (a) for an electron with a wavelength equal to 1.7 x 10-15 m, a typical nuclear size. Ke = _____eV Homework Equations...

Oh! The voltage changes, so I need to calculate the second voltage, right?

Homework Statement A parallel-plate capacitor has plates with an area of 383 cm2 and an air-filled gap between the plates that is 1.51 mm thick. The capacitor is charged by a battery to 575 V and then is disconnected from the battery. (a) How much energy is stored in the capacitor? (b)...

Homework Statement The electric field at the point x = 10.0 cm and y = 0 points in the positive x direction with a magnitude of 10.0 N/C. At the point x = 20.0 cm and y = 0 the electric field points in the positive x direction with a magnitude of 20.0 N/C. Assume that this electric field is...

I was using the electric force instead of the tension! Silly mistake. Thank you

Homework Statement Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.65 g and a charge of magnitude q. The balls are attracted to each other, and the threads attached to the balls make an angle of 20.0° with the vertical, as shown in the figure below...

Homework Statement (a) Find the magnitude and direction of the net electrostatic force exerted on the point charge q3 in the figure below. Let q = +1.5 µC and d = 27 cm. http://www.webassign.net/walker/19-31.gif Homework Equations The Attempt at a Solution I found Fx = 1.7 N...

Homework Statement A point charge with charge q1 is held stationary at the origin. A second point charge with charge q2 moves from the point (x1,0) to the point (x2,y2). How much work is done by the electrostatic force on the moving point charge? Express your answer in joules. Use k...

This might be a really dumb question, but why do you divide instead of multiply?

Homework Statement A 600 kg car is going around a banked curve with a radius of 110m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction? Homework Equations N cos{theta} = mg N sin{theta} = mv^2/r The...

I don't know. That's the question in its entirety, and the answer is not 0, so there must be a way of figuring it out.

Homework Statement A reversible refrigerator has a coefficient of performance equal to 9.55 What is its efficiency? Homework Equations COP = Qh/W e = W/Qh The Attempt at a Solution I thought e would simply be 1/9.55 = 0.1047 =0.105 (Sig. fig) This answer was incorrect...

Homework Statement An ideal gas is kept in a container of constant volume. The pressure of the gas is also kept constant (a) If the number of molecules in the gas is doubled, does the rms speed increase, decrease, or stay the same? (b) If the initial rms speed is 1300 , what is the final...

Omg...I feel like a complete moron.