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,

                                                salad                            : 400 Cal

                                                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!

---------------------------------------


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!

-------------------------------------

 

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!

 

----------------------------

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!

---------------------

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

----------------------

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