The temperatures of the main Fig. 2.2 shows all the thermal energy (heat) inputs to the bedroom in one hour.
thermal energy input to bedroom
through door and walls from main room
50 000J
through walls from outside of house
2 000 000
through window
1 000 000
from person sleeping in bedroom
250 000J​

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.