Recent content by sskk221

yeah I did 4eV*1.6e-19 to convert it to Joules. Then I divided by Planck's constant to get the frequency. This problem seems so easy, but I'm missing something... :\

Homework Statement The following diagram represents the allowed electronic energy levels of a hypothetical atom. What frequency photon would be required to ionize this atom if it were already in the n = 2 state? [PLAIN]http://img32.imageshack.us/img32/667/picture2vt.png Homework...

Let's say that there are three lenses A (all of which are semicircles: flat on one side, curved on the other). One lense is a short and curved D, another lense is a very elongated and narrow D (longer than the first lense), and the third lense is as long as the second lense but has a sharper...

Let's say that there are three lenses A (all of which are semicircles: flat on one side, curved on the other). One lense is a short and curved D, another lense is a very elongated and narrow D (longer than the first lense), and the third lense is as long as the second lense but has a sharper...

Homework Statement Consider all possible isothermal contractions of an ideal gas. The change in entropy of the gas: A) does not increase for any of them B) increases for all of them C) is zero for all of them D) decreases for all of them E) does not decrease for any of them...

Homework Statement Two asteroids are deep in space, far from any external influences. They each have a mass of 1010kg and are separated by distance L (center to center). They travel in a circular orbit around the center of mass of the system (radius of either orbit: R= 0.5L), under the...

Homework Statement Three identical balls, with masses of M, 2M, and 3M, are fastened to a massless rod of length L as shown. The rotational inertia about the left end of the rod is: http://img13.imageshack.us/img13/1424/1234sjy.jpg Homework Equations I = MR^2 The Attempt at a Solution I...

Homework Statement A moving shuffleboard puck has a glancing collision with a stationary puck of the same mass. If friction is negligible, what are the speeds of the pucks after the collision? http://img179.imageshack.us/img179/277/phyqp2.jpg The Attempt at a Solution I ended up with...

haha thanks for the help! Forgot that the Normal force (N) can be replaced with "mg"

Homework Statement A hockey Puck is hit and starts moving at 12m/s. Exactly 5 s later its speed is 6m/s. What is the coefficient of friction? How far has the pick traveled during the 5 s? Homework Equations \vec{F}_{net} = \Sigma \vec{F} = m \vec{a} f_k = \mu_k N The...