Recent content by duran9987

I chose ##Q_h## because the problem wants me to return 3000 joules of energy to the outside. If I set ##Q_c## to 3000J I would be returning more energy (Including the energy from the work, which wouldn't be wrong i guess since I technically am returning the incoming 3000 joules plus some...

Homework Statement The temperature inside the room ##T_I= 25 C ## and the temperature outside the house is ##T_O = 32C##. The temperature difference causes energy to flow into the room (by conduction through the walls and window glass) at the rate 3,000 J/s. To return this energy to the...

Homework Statement Compute the radiation pressure exerted by a gas of photons (according to kinetic theory). There are N photons, each with energy hf, the momentum is hf/c, and the walls are perfectly reflecting. Express the pressure in terms of N, V, and the product hf. Homework Equations...

This clears a lot up for me. Thank you very much. I see that Φ = 2θ and can now make sense of the books equations. But I am thinking of your question about negative cosθ.. for values of 0 ≤ θ ≤ π .. 2bcosθ just traces the graph… I'm not sure what the equation is missing.

Thanks for the response! Hello TSny, thank you for the reply. So just to clarify, when i am evaluating the vector in polar coordinates i should always consider the angle between the radius of the circle and the horizontal, not the angle that the position vector makes with the horizontal??

Homework Statement A particle moves with constant speed ν around a circle of radius b, with the circle offset from the origin of coordinates by a distance b so that it is tangential to the y axis. Find the particle's velocity vector in polar coordinates. Homework Equations (dots for time...

Thank you, I appreciate your response. I am already settled down and have my own little family which luckily enough supports me incredibly. Up until now I have not thought about how different school will be between undergrad-grad-phd, so I thank you for that thought.

Thank you for your response. I did not have the opportunity to go to college after high school but I now find myself in a position where college is an option for me. I would be a full time student/ full time worker but as i said, I am extremely motivated and looking forward to this challenge...

Have a personal question for those familiar with the field. I am an "older than usual" undergrad student who is very interested in physics. At 27 years old I have fallen in love with understanding the world through physics and mathematics. I will be declaring myself a physics major this...

I just began reading Feynman lectures and it turns out that during evaporation, water molecules that move faster than average (higher temp) break away from the attraction of their neighbors leaving behind molecules that move slower than average (lower temp) and result in a cooler liquid. When a...

Homework Statement A bit confused here as to what wave speed is dependent on. At first I learned that v = λƒ, and a couple of pages later in my textbook I find that v = √(τ/μ). Also, I found that speed is only dependent on the properties of the medium, specifically its elasticity and mass...

A bit confused here as to what wave speed is dependent on. At first I learned that v = λƒ, and a couple of pages later in my textbook I find that v = √(τ/μ). Also, I found that speed is only dependent on the properties of the medium, specifically its elasticity and mass. Where does wavelength...