a 3 X 10^2 kg piano is being lifted at a steady speed from ground level straight up to an apartment 10.0 m above the groundthe crane that is doing the lifting produces a steady power of 4.00 X 10^2 Whow much time does it take to lift the piano and how do you mathmatically write this out?
You should insulate both pipesWhen the weather is cold the hot water pipe will sweat and when the weather is hot the cold water pipe will sweatIt has less to do with energy efficiency and more to do with the pipes dripping the water that they sweat onto the drywall ceilings or inside the walls that might be partially exposedI hope that helps.
Power Work / time In this case Work mgH So, P mgH / t or t mgH/P where m 300kg, g9.8m/s/s, H10m, and P 400 W t 73.5 seconds
Only insulate any cold pipes that are outside, otherwise, don't bother with themFoam insulation is only good up to -5 degrees.
