Recent content by dragon-kazooie

Huh. I will have to go back to that section and see if it is written incorrectly or if I just understood it wrong. Thank you!

Oooooooh! So the density difference is because the mass is lower, not because the molecules are closer! It makes sense now. Thank you for explaining that so clearly and linking more info!

Homework Statement Sorry, it's not an actual problem, it's just a statement I don't understand from my text - "The density of water vapor is less than that of dry air. Therefore, the higher the humidity (that is, the more water vapor there is in the air), the lower the density of the air. For...

Thank you @haruspex! That was driving me crazy!

Thank you!

Homework Statement 1. A fountain shoots water out of the ground at a 40° angle. It’s horizontal velocity is 2 m/s and the water lands 3 meters away. What is the maximum height that the water reaches during that time? Homework Equations Dy =vit + ½ at2 and Vfy2 = Viy2 + 2ady The Attempt...

Hi! I would just like someone to verify that I am doing this correctly (and point out what I am doing wrong if I am not). A friend is getting T = 0.148s but I don't have her calculations, but I think I am solving the problem correctly and getting 0.9634s. 1. Homework Statement A 0.87 kg mass...

Thank you!

Oh goodness, I got myself all mixed up. I should have written "I compared answers with a friend who got 0.02 N/C to the left, and I can't figure out how they got that answer, so I'm hoping mine is right..." Thank you for asking for clarification. I'm sorry that I didn't proof read my question...

I think I have this correct, could someone please verify? I compared answers with a friend who got 2.0 x 106 N/C to the left, and I can't figure out how they got that answer, so I'm hoping mine is right... 1. Homework Statement A negative charge of 3.5 × 10–8 C experiences a force of 0.070 N...

Hi! I have this problem: Homework Statement Which combination will produce the least degree of diffraction? A. λ of 2.0m through an opening of 1.0 cm B. λ of 30m through an opening of 2.0 m C. λ of 2.0m through an opening of 25 m D. λ of 5.0nm through an opening of 45 m The Attempt...

So, you're saying that work is equal to Δk or -ΔU, but net work is only equal to Δk? (Because in the crane example, there's still a change in potential energy, even though there's no change in kinetic energy and no net work.) That seems really weird.

edit: nevermind, I was asking another questions but I figured that part out. Thanks!

Wow, thank you all for your help! I see the difference between work and net work now. You kind of lost me with all of the integral equations but that's ok, it seems to have sparked some good discussion. One last thing... slowing things down seems to be doing work. You're changing the kinetic...

Thank you for your help! Hyper Physics is usually a helpful site but it also explains work as change in kinetic energy. Is there some detail here that I'm missing that makes it ok for them to define it that way? http://hyperphysics.phy-astr.gsu.edu/hbase/work.html#wepr