Recent content by bjarnidk

Yes it was of great help. Thank you.

I agree. Which is why I'm asking what I should focus on to study QM. Notice I already have an acceptable introductory background in physics and mathematics.

Thanks guys. Like I said, though, I don't want to practice physics. I only want to be able to understand QM and be able to lead a conversation with an actual physicist about QM. I think my title is misleading. I only want to understand QM to a great degree without actively researching in the field.

I'm a person with many interests and I'm torn between them as I cannot focus on all at once. I am very academically adapt but I am also extremely interested in human contact, especially the protection of people. Currently I'm studying medicine but I would also love to be in the army or the...

I've got the impulse at the point of collision to be 16. If I could convert this to force I could use torque to solve my problem, but I don't have a time value.

Can you just make it obvious what I am supposed to do, I've been sitting here for a few hours again and there's just something that I'm missing. Please, I got this due for monday and I need to work on other assignments during the weekend :'(

I see. The linear momentum of the ball is NOT conserved (where does it go, though? Isn't this an elastic collision?) but the angular momentum of both the ball AND the rod are conserved. Does this mean that the angular momentum of the ball gets transferred to the rod? How do I get a feeling for...

I'm back at this problem... So I=1/3*9,1*4 according to my book, I for a slender rod around an end-point = 1/3*ML^2. I see that there is a change in momentum of the ball. Do you mean to say that the change in momentum of the ball = momentum of the rod?

Sorry, I edited the post and added the speeds. I only understand how angular momentum affects something that is already rotating...Like an ice skater pulling his arms into increase his rotational velocity. I don't understand how an object traveling in a horizontal vector can even be affected by...

Homework Statement A thin, uniform metal bar, 2.00 m long and weighing 90.0 N, is hanging vertically from the ceiling by a frictionless pivot. Suddenly it is struck 1.50 m below the ceiling by a small 3.00-kg ball, initially traveling horizontally at 10 m/s The ball rebounds in the opposite...

Thanks!

Homework Statement An object slides down a 30° angled slope with even velocity. The object is hit with a force such that its initial velocity is now 2,5m/s up the slope. How far does the object go before coming to a stop (I answered this, though) and how much of the kinetic energy becomes...

Sorry, \mu is tan30, but the force of friction is 3,3m, would that be correct?

Homework Statement An object slides down a slope of 30° to the horizontal with CONSTANT VELOCITY. Find the force of friction and the energy lost on the way down. Homework Equations \mu m g \cos \theta \mu m g \cos \theta - m g \sin \theta = 0 W = K_2 + U_2 - (K_1 + U_1) The Attempt...

So when me and my girlfriend cook, a typical setup might look something like a pan on one heater and a pot with something on the other. Today I was cooking eggs and she was boiling water. Something was in her water (didn't look like eggs at all) and she said it was the eggs from my pan...