Recent content by DracoMalfoy

i understand. i got the answer. d i think

Homework Statement Star 1 emits energy at a rate that is 2 times that of Star 2. If Star 1 also has a radius that is 3 times larger than Star 2, how do the temperatures of the stars compare? a. Star 1's temperature is 2.58 that of Star 2. b. Star 1's temperature is 3.75 that of Star 2. c...

Homework Statement The bottom of a circular, aluminum pot has a radius of 8cm and a thickness of 1cm. The temperature of the stove top is 120 degrees celsius and the temperature of the pot initially is 20 degrees celsius. What is the rate at which energy is transferred through the bottom of the...

these sources are given to us by our teacher but I guess it depends on where you go to find them. I've been told that none of the answers are the correct choice but that's impossible ._. I haven't looked in the textbook yet. I am still confused on whether or the answer is supposed to be...

387 j/kg degreeC is specific heat (https://cnx.org/contents/Ax2o07Ul@10.1:XA0Vd8Dc@6/Temperature-Change-and-Heat-Capacity) and 134 comes from here as Lf (https://cnx.org/contents/Ax2o07Ul@10.1:Xyta70lI@9/Phase-Change-and-Latent-Heat)

Qtot= Mc(Tf-Ti)+ MLf = (1.5)(387)(1000-1083)+ (1.5)(134x10^4) im not getting the answer with anything that i try doing

mc ΔT+mL so mc ΔT+mL+mc ΔT=Qtot? I am sorry if it seems like I am a complete idiot with this. I am really trying to figure this out. Its really difficult for me. I am not understanding and I am getting really frustrated...

The temperatures. I was following an example that we did in class. I am not understanding. I guet that nothing is changing from 0 to whatever temperature in the problem. I think i see that now. Its just how I am supposed to set up the equation.

i really don't know what I am doing here...

I figured that. I am getting a bit frustrated. i knew that i was doing it wrong. i keep getting an answer around 5.8x10^5. This is really difficult for me, and i don't have a very good teacher.

Homework Statement How much energy must be removed from the system to turn liquid copper of mass 1.5kg at 1083 degrees celsius to solid copper at 1000 degrees celsius? a. -2.49X10^5J b. -3.67X10^4J c. 2.25X10^3J d. 9.45X10^4J e. -2.78X10^3J Homework Equations Q=Mc(Tf-Ti)...

Thanks. Ill check it out. I tried again and got A. But the powers came out different on my calculator.

yes. we just learned this yesterday. i guess id have to look through the book. The teacher isn't very good. the class notes given are a bit confusing to understand

I honestly don't know. I'm too frustrated to think straight at the moment. I am mad that I am not getting this.

Homework Statement What is the kinetic energy of a particle in 2mol of nitrogen gas at atmospheric pressure that is within a volume of 100m^3?a. 1.27X10^-17J b. 3X10^5J c. 6.8X10^-16J d. 2.97X10^7 e. 9.9X10^-14J Homework Equations PV=nRT n=Numberof particles/Na Na=6.02x10^23 R=8.13 J/Mol The...