Recent content by Lisa Marie

Homework Statement 5 kg of water at 60 degrees are put in contact with 1 kg of ice at 0 degrees and are thermally isolated from everything else. The latent heat of ice is 3.3x105 J/kg What is the change of entropy of the universe when 100J of energy are transferred from the water to the ice...

Um I'm not really sure because there is two unknowns... so I guess I need another equation?

So I should use this volume: V0=πr2h =π(0.0075/2)2(1) =4.42×10-5 ...because I'm not getting the right answer

Ok I see so you have to use (5-mf) but then there are two unknowns...

Ok thanks! I'll try it with just change in length but doesn't the volume change since the length is changing?

Homework Statement 5.0 kg of ice at 0◦ is put into 3.0 kg of water at 20◦C. Assuming that they are isolated, that cH2O = 4186 J /kg K , and that L = 3.3 × 105 J/ kg how much ice is left when the system comes to equilibrium? Homework Equations Q= +/- mL Q=mcΔT The Attempt at a Solution...

So you would do M=∫ρdV to find the mass?

Homework Statement A 1.0m long rod of metal has a diameter of 0.75 cm. This metal has a coefficient of linear expansion α = 4.8 × 10−5 1/K , a density of 9.7 × 103 kg/ m3 , and a heat capacity of 390 J/K . How much energy needs to be added as heat to increase the length of the rod by 7.5 × 10−3...

Homework Statement 2.0kg of a metal (for which c = 620 J kg K ) is immersed in 1.5kg of water, initially at 20◦ . What is the final temperature if 8.0 × 104J are added as heat? Homework Equations Q=mcΔT The Attempt at a Solution So I was able to get the correct answer what I did was: Qadded...