Recent content by eq123

thank you for your fast respond :) i couldn't figure anything out for problems 1, 3, 4 :( as for problem 2 .. this is what i did ..when relaxed wnet = ws + wg = ∆k = 0 ws = -wg Fs d = -Fg d Fs = -Fg -kx = -mg k = mg/x = 2(9.8)/(0.06) = 327 N/m when external force is applied ws = -0.5k(x2f -...

hey everyone .. I've been working on some old exam problems .. i couldn't figure these out :( A 40-g bullet, with a horizontal velocity of 500 m/s, comes to a stop 20 cm within a solid wall. What is the magnitude of the force from the wall stopping it? (Assume this force to be constant) (Ans...

thank you.. but how can i relate this to the wavelength concept? this is not a homework problem.. it is an old exam question.. i would appreciate any additional information..

i've been trying to figure out this problem.. The longest wavelength of light that causes electrons to be ejected from the surface of a copper plate is 243 nm. What is the maximum velocity of the electrons ejected when light of wavelength 200. nm shines on a copper plate? the answer is...

i already figured it out.. since the electron is returning to its ground state.. it is releasing energy.. which means that ∆E is negative.. after taking that into consideration.. the answer should be 7.. wow.. it makes more sense to me now! thank you.

this problem is killing me! [calculation of electron transition] i've been trying to solve this problem.. the answer should be 7.. my answer is 0.7 ! What is the value of n_i for an electron that emits a photon of wavelength 93.14 nm when it returns to the ground state in the H atom? my...