ENERGY ASSIGNMENT                                      DUE_______________________HOW MUCH ENERGY IS USED BY YOUR LIFE IN A WEEK? You will be estimating most items. One suggestion is for a typical winter week, keep track of your activities and energy usage, then estimate for both weekdays and weekends.            This is an individual project. The information should be presented neatly and clearly, and all assumptions, estimations and calculations understandable and legible.            The paragraphs of conclusions for each sections, and at the end should refer to actual measurements as well as methods used.            It is very important that you check your units and calculations as you go along.            For each category, list the calculations you used to determine it, the assumptions (sources)  and estimations you had to make and the value in Joules, Calories, KW-Hrs, and Jelly Doughnuts.             Write conclusions about any sources of error, or other information. Make sure you include totals. Compare the different methods used. Compare the different types of energy. Which is most/least accurate? How much are you normal or non-average for each?** What did you learn from this, and how will it change your life/attitude/outlook?

Be Prepared to share your information with the class and discuss your results.

You should have a detailed sheet with lists and calculations FOR EACH TYPE!            You should have a summary sheet showing final totals for each type, the results in different units, and total calculations.. Include a spot to compare yourself to the class average. Personal/Mechanical in a week (finish by Feb break?)Energy used to move your body estimated at least two different ways:            1. Estimate total KE ( 1/2mv2) for a week (using average velocity), and total GPE (weight times height = mgh)  and work (weight times Dis=F*D)) for a week. (Add together)              2. Energy used to move your body from charts, based on activities  Compare the two methods and try to conclude which is most accurate, what you found out, some reasons while they are different… Energy Intake (Food, etc...) Does it equal the personal energy output? Why/Why not? What does this tell you?-----------------------------------------------------Electrical in a week (Calculate two different ways)            Use chart/sheets of information to estimate for each appliance, power times time.             Compare to electrical bill/actual usage from electrical meter Shower Energy in a week: both heating and moving the water. (note: this should be already included in the electrical & heating, unless you have some sort of gravity pump) Heating your House/Water: Transportation:OTHER TYPES: (both input and output)
SCORING RUBRIC PHYSICS ENERGY PROJECT

CONTENT                                                                                         40

Mechanical Energy                                          10

Personal Energy                                              5

Food                                                                5

Electrical                                                          5

Heat                                                                 5

Transportation                                                 5

Shower                                                            5

OVERALL CONCLUSIONS                                                                        30

Each Section                                                    7

Overall                                                                        7

Class Comparison                                           7

QUALITY                                                                                          17

Organization                                                    6

Accuracy                                                         6

Clarity                                                             4

INSIGHT                                                                                            12

Analysis                                                          4

Class Discussion                                             4

Implications                                                     4

SOME SAMPLE SECTIONS (way shorter than your project):

MECHANICAL ENERGY:

1)         I move up the stairs 5 times a day. My mass is 20 kg, and the stairs are 10 m high.

So my gravitational potential energy for a week is mgh * 5times * 5 days. (I don’t move on weekends!)

20 kg (9.8)*10m=1960 Joules * 5=9800 Joules* 5 days

GPE= 49, 000 Joules per week

I walk up and down the hallway 20 times a day, and it is 50 m long. Over a typical day, I walk another 100 m total (see my chart for list of walking). Then I walk another 200 m on the weekend.

So that means I walk about 1400 m total in a week. That’s over 2 hrs a day*60*60= 7200 sec

So my average velocity is 1400/7200 = .2 m/s in a week for my average velocity.

My kinetic energy is ½ m v2 = .5 (20) (.2)2 = 0.4 Joules!

The work I do to move myself is my Weight*Distance= 196 N* 1400 = 280, 000 Joules

My total mechanical energy is GPE + KE (I won’t bother counting my elastic potential energy because I am not a spring!!!) ME= 49000 + .4 + 280,000 = 330,000 Joules (about)

2)         I now compare to my activities list I got from countmycalories.com….

I list out my sleeping (50 Cal/hr) * 10 hrs/day*7 days= 3500 Cal

My running/walking 120 Cal/hr * 10 hrs/week = 12000 Cal

My using a rotary saw is 100 Cal/hrs * 2 hrs/week = 200 Cal

My other activities add up to 11, 000 Cal a week…..

So my total for a week is 27, 000 Cal for the week….

27, 000 Cal * 4187 Joules/Cal = 100, 000, 000 Joules a week…..

I guess the mechanical energy way one doesn’t account for all the stuff I do!!!

3)  My food intake a day is ham egg and cheese sandwich: 300 Calories,

pizza                            :1300 Cal

other                            : 1000 Cal

So that’s 3000 Cal a day, or 21, 000 Cal a week*4187= 80, 000, 000 Joules… I should be losing weight!

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ELECTRICAL:

1) My bill for the month is \$40, and is about 600 KW-Hrs a week.

2) When I read my electric meter it is 1249180 on Monday and 124900 the next week, so I used 720 KW-Hrs that week…

3) I add up all my devices,

I have 5 100 Watt light bulbs I use for 5 hrs each a week.

0.1 KW * 5 hrs = .5 KW Hrs * 5 = 2.5 KW Hrs a week

I have a 500 Watt TV I use for 4 hrs a day

0.5 KW * 4 * 7 = 14 KW Hrs a week

I have a 1100 Watt fridge I use for 168 hrs a week

1.1 * 168 = 200 KW Hrs…

So my total adds up to be about 350 KW Hrs a week, I must have forgot some stuff…, 900 million Joules!

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My Shower:

My showerhead says 10 gal/min, and I take a 10 min shower, so I use 100 gallons.

I also held a cup under the faucet for 10 seconds, and got 1.5 gallons ( 8 gal/min)

I convert that to kg ( gal to L to Kg) and get that I use 380 Kg of water in a shower.

It gets lifted up from my basement for 10 m, so the work is mgh=380*9.8*10=36, 000 Joules

To Heat the water it goes from 2 degrees Celsius to 32 degrees Celsius (cold to hot)

30 degrees change….

So the Calories used is 380 Kg * 30 degrees= 10, 000 Calories = 41, 870,000 Joules to heat it!

so my energy for a shower is 41,900,000 Joules!

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My Heat:

I get my oil heat bill and figure it uses 40 gallons of oil a month, and convert it to Joules.

60 billion Joules!

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My Car:

I travel 30 miles a day, and my car gets 20 mpg, so I use 1.2 gal a day times 7 days for 10 gallons of gas a week, and I convert that to Joules…

1.5 billion Joules

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I add up my Mech Energy plus Electrical plus Heat plus Car plus other and get

About 63 billion Joules total! = 15 million Calories, 35, 000 Jelly DoughnutS!
UNIT CONVERSIONS FOR ENERGY

 WANT→ Joules kilocalories(food Calories) KNOW↓ J Calories 1 Joules J(N-m) = 1 J 0.000238834 Calories 1kilocalories(food Calories) Calories = 4187 J 1 Calories 1 British Thermal Units BTU = 1055 J 0.251996 Calories 1 Kilowatt-Hours KWHr = 3599406 J 861 Calories 1 Foot-Pounds ft-lbs = 1.356 J 0.000324048 Calories 1 FuelOilGallons = 154449647 J 36889 Calories 1 GasolineGallons = 134659880 J 32168 Calories 1 Coal kilograms = 20992945 J 5021 Calories 1 Ergs = 9.99835E-08 J 2.38846E-11 Calories 1 Grams of Fat = 39776 J 9.5 Calories 1 Jelly Doughnut = 1046750 J 250 Calories 1 full cord wood = 21101120 J 5040 Calories 1 cu ft nat gas = 1076157 J 257 Calories WANT→ KNOW↓ FuelOilGallons GasolineGallons 1 Joules J(N-m) = 6.4746E-09 FuelOilGallons 7.42608E-09 GasolineGallons 1kilocalories(food Calories) Calories = 2.71078E-05 FuelOilGallons 3.10865E-05 GasolineGallons 1 British Thermal Units BTU = 6.83107E-06 FuelOilGallons 7.83368E-06 GasolineGallons 1 Kilowatt-Hours KWHr = 0.023290596 FuelOilGallons 0.026729597 GasolineGallons 1 Foot-Pounds ft-lbs = 8.77838E-09 FuelOilGallons 1.00324E-08 GasolineGallons 1 FuelOilGallons = 1 FuelOilGallons 1.146771742 GasolineGallons 1 GasolineGallons = 0.872013116 FuelOilGallons 1 GasolineGallons 1 Coal kilograms = 0.135943349 FuelOilGallons 0.155895991 GasolineGallons 1 Ergs = 6.46961E-16 FuelOilGallons 7.42489E-16 GasolineGallons 1 Grams of Fat = 0.000257524 FuelOilGallons 0.000295322 GasolineGallons 1 Jelly Doughnut = 0.00677696 FuelOilGallons 0.007771634 GasolineGallons WANT→ British Thermal Units Kilowatt-Hours KNOW↓ BTU KWHr 1 Joules J(N-m) = 0.000947969 BTU 2.77822E-07 KWHr 1 kilocalories(food Calories) Calories = 3.96 BTU 0.001163 KWHr 1 British Thermal Units BTU = 1 BTU 0.000293297 KWHr 1 Kilowatt-Hours KWHr = 3412 BTU 1 KWHr 1 Foot-Pounds ft-lbs = 0.001280675 BTU 3.76616E-07 KWHr 1 FuelOilGallons = 146390 BTU 42.9 KWHr 1 GasolineGallons = 127654 BTU 37.4 KWHr 1 Coal kilograms = 199001 BTU 5.83 KWHr 1 Ergs = 9.47817E-11 BTU 2.77778E-14 KWHr 1 Grams of Fat = 37.7 BTU 0.011 KWHr 1 Jelly Doughnut = 992 BTU 0.29 KWHr 1 full cord wood = 20000000 BTU 5.86 KWHr 1 cu ft nat gas = 1020 BTU 0.299163195 KWHr UNIT CONVERSION Coal kilograms Ergs 1 Joules J(N-m) = 4.76348E-08 Coal kilograms 10001606.4 Ergs 1 kilocalories(food Calories) Calories = 0.000199406 Coal kilograms 41868000000 Ergs 1 British Thermal Units BTU = 5.02494E-05 Coal kilograms 10558701000 Ergs 1 Kilowatt-Hours KWHr = 0.171457886 Coal kilograms 3.6E+13 Ergs 1 Foot-Pounds ft-lbs = 6.43531E-08 Coal kilograms 13558181.04 Ergs 1 FuelOilGallons = 7.356005321 Coal kilograms 1.54569E+15 Ergs 1 GasolineGallons = 6.414533119 Coal kilograms 1.34682E+15 Ergs 1 Coal kilograms = 1 Coal kilograms 2.09964E+14 Ergs 1 Ergs = 4.76272E-15 Coal kilograms 1 Ergs 1 Grams of Fat = 0.001894353 Coal kilograms 3.97746E+11 Ergs 1 Jelly Doughnut = 0.049851404 Coal kilograms 1.0467E+13 Ergs WANT→ Foot-Pounds grams of CO2 released KNOW↓ ft-lbs gms CO2 1 Joules J(N-m) = 0.73768021 ft-lbs 0.000142904 gms CO2 1kilocalories(food Calories) Calories = 3088 ft-lbs 0.598211642 gms CO2 1British Thermal Units BTU = 778.16932 ft-lbs 0.15074804 gms CO2 1 Kilowatt-Hours KWHr = 2655223.9 ft-lbs 514.3736555 gms CO2 1 Foot-Pounds ft-lbs = 1 ft-lbs 0.000193721 gms CO2 1FuelOilGallons = 113916206.8 ft-lbs 22068.00552 gms CO2 1 GasolineGallons = 99336426 ft-lbs 19243.59018 gms CO2 1 Coal kilograms = 15486157.88 ft-lbs 2999.999977 gms CO2 1 Ergs = 7.37562E-08 ft-lbs 1.42882E-11 gms CO2 1 Grams of Fat = 29336 ft-lbs 5.683010596 gms CO2 1 Jelly Doughnut = 772000 ft-lbs 149.5529104 gms CO2 1 full cord wood = 15563386.4 ft-lbs 3014.960793 gms CO2 1 cu ft nat gas = 793732.7064 ft-lbs 153.7630004 gms CO2 WANT→ KNOW↓ grams of fat JellyDoughnut 1 Joules J(N-m) = 2.51405E-05 grams of fat 9.55338E-07 JellyDoughnut 1 kilocalories(food Calories) Calories = 0.105263158 grams of fat 0.004 JellyDoughnut 1 British Thermal Units BTU = 0.026525895 grams of fat 0.001 JellyDoughnut 1Kilowatt-Hours KWHr = 90.63157895 grams of fat 3.444 JellyDoughnut 1 Foot-Pounds ft-lbs = 3.41103E-05 grams of fat 1.29619E-06 JellyDoughnut 1FuelOilGallons = 3883.125731 grams of fat 147.56 JellyDoughnut 1 GasolineGallons = 3386.133368 grams of fat 128.67 JellyDoughnut 1 Coal kilograms = 528.5938187 grams of fat 20 JellyDoughnut 1Ergs = 2.51417E-12 grams of fat 9.55384E-14 JellyDoughnut 1 Grams of Fat = 1 grams of fat 0.038 JellyDoughnut 1 Jelly Doughnut = 26.31578947 grams of fat 1 JellyDoughnut