Energy to heat water:
NOTE:
- If you do NOT show calculations, no points are awarded.
- No penalty will be assessed if you do not show units. However, you risk
setting up the problem incorrectly if you do not show units so that they
cancel properly. - If your setup is correct but you make an arithmetic error, there is no
penalty.
(c) 3 points maximum NOTE: There are no points for just listing ideas. Each
idea MUST be explained. The following are ideas that you could use to write
your paragraph(s). Take these ideas and create an outline of the order in which
you wish to answer them. You do NOT need to use all ideas. Before you begin,
decide on the format of how you wish to answer your question (pros versus cons,
chart format with explanations within the chart, compare and contrast, etc.).
(i) Discuss the economic and environmental costs and benefits of using a
washing machine in terms of its manufacture and disposal. (1 point) ■
Manufacturing washing machines provides jobs in mining, smelting,
designing, engineering, manufacturing, transportation, administration,
advertising, repair, and sales.
■ Use of natural resources in the manufacture and distribution of washing
machines. Examples: use of renewable or less polluting energy sources in
manufacturing; use of less polluting methods of transportation.
■ Advantages of repairing washing machines rather than discarding them.
Discarding them creates landfill issues. Recycling of metal parts and
packaging material saves energy and decreases landfill issues.
(ii) Discuss the economic and environmental costs and benefits of using a
washing machine in terms of selecting one and purchasing it (specifically,
how can consumers compare various appliances in terms of their energy use).
(1 point) ■ Energy efficiency of different models. The U.S. Department of