Recent content by jlyu002@ucr.e

Thank you sophiecentaur, russ_waters, chestermiller for all your help! I finally had the aha moment. All your comments help put together the picture. Physicsforums is the best!

Hello Sophiecentaur, I am still having a slight bit confusion. I feel I am very close to understanding this completely. 1. during evaporation, the kinetic energy of the water molecule reaches a point in which it escapes into the atmosphere as gas. The water molecule had absorbed the heat from...

Hello, I understand how evaporation contributes significantly to heat loss through the loss of KE from the vibrating water particles on the skin; However, what about the sweat droplets that come off of a person. This water has Kinetic Energy and is now being displaced from the body(the...

I am not sure what intensity actually looks like and means for light. Does this mean that ex red photon, that there are more than one photon that are superimposed on each other hitting the same spot?

I understand that radio waves have very low frequency, which means it is not ionizing as gamma and ultraviolet are, but while browsing the web, it seems that there are mixed point of views on its potential hazard to human health. Hmm, if it is dangerous, why? Does it have to do with intensity...

Sweet! Thank you good sir!

Homework Statement : There is tank with a certain depth with water that is exposed to air. There is a hole at the bottom of the tank. Using Bernoulli's equation, we can find the efflux speed. density of the water * gravity * depth = 1/2density of water * velocity ^2. This will give us the...

Thank you k9!

Thanks Dalespam!

Would Electric Field on the surface of a conductor point inwardly due to the excess of negative charges on the surface? Lastly, I cannot seem to conceptualize why the E field inside the conductor is zero? Is it due to the protons that are in opposition to the electron's efields? Thanks...

Hi Sir Chet, From your explanation I feel very close to understanding. I just have two more questions: I was wondering if there was no needle, if the direction of force per unit length would be horizontal with the neighboring outer water molecules for the outer most water layer for ex. a ball...

I have went through the thread and looked at the explanations for surface tension, and I have also went online to about 10 different websites, but I have not yet been able to figure out this concept. I think it is just my inability to understand and I need perhaps a different way of explaining...

Since it does have an electric field, if we were to put a positive test charge near it, would it exhibit an inward field or an outward field?

Ohh, I get it better now. The concept of light is quite intense. Such a weird phenomena in nature. I guess I am a weird phenomena in nature too!

OO hmm, all these ideas have brought new ideas into my head. I was wondering then, what it meant by Efield and Bfield oscilating. Does that mean as we measure the photon in time, the Efield and Bfield that is associated with the photon would oscillate in their planes? Meaning we measured more...