I think I understood the first part fine. I just included in in case anything was needed from it for part 2.
I think I get the second part now...the use of different terms to refer to the same variable was throwing me off.
I should just use 1/U=(1/h1)+(1/ktotal)+(1/h2). U will equal the U...
Homework Statement
1) A typical wall construction for a single-family residence might consist of 0.375 inches of outer sheathing (insulating board, hardwood siding, etc.), 3.5 inches of mineral fiber insulation and then a 0.375 inches inner surface (gypsum, etc.). Typical thermal...
Got it. Thank you!
I knew it must be something simple like that but I was getting hung up because I just could not visualize exactly what this thing is supposed to look like.
1.
Calculate the force needed to move the wire in the figure (Figure 1) if it holds a soapy solution (surface tension is 0.025 N/m) and the wire is 16.0 cm long.
Express your answer to two significant figures and include the appropriate units.
2.
γ(surface tension) = F (force) / l (length)...