Which of the following has the largest R-value? (Use the table of R-values on page 111 of the textbook.)
A. 25 mm of air space with a reflective surface on the inside of the wall cavity
B. 50 mm of expanded polystyrene
C. 25 mm of fibreglass
D. 25 mm of rigid urethane foam

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!

When using the scientist method, which step comes last?

Atoaster oven has a resistive heating element. the average rate at which it dissipates energy as thermal energy is 1.00 \(\rm kw\). in the united states, emf amplitude in household circuits is \(\mathcal e_{\max}\) = 170 \({\rm \; v}\) and the \(\rm ac\) oscillation rate is 60 \(\rm hz\). part a what is the root-mean-square current through the heating element?