Friday 13 Nov:

 

Target : Energy

 

  (Conservation of E

Journal:   

Major Sources of Total Electricity Net Generation
 
 
Most electricity net generation came from coal. In 2008, fossil fuels (coal, petroleum, and natural gas) accounted for 71 percent of all net generation, while nuclear electric power contributed 20 percent, and renewable energy resources 9 percent.

In 2008, 67 percent of renewable energy resources was derived from hydroelectric power.

 

 

 
Petroleum Overview

 

 

 

You are the President: Pick one major area of production and defend (debate) why your plan is the best.

Two page Paper due Wed 18th:

 

Cover things like:

1. Is major production increase possible over the next ten to 15 years?

2. Cost to consumer.

3. Politics of significant increase in the future

4. Environmental impact

5. If yours is the right answer, why don't we have more of it now (history of production up to now)?

 

 

Areas:

1. Coal

2. Petroleum & Natural Gas

3. Nuclear

4. Renewable (Hydro, Wind, Solar)

 

 

 

 

1. Tower Contest:

  •  Due after Christmas Vacation  Monday  (Jan 25th)

 

 

Tower Building:

                                  

 

Goal: To Build the lightest tower possible that will hold up to 22kg of mass (the ratio of weight of your tower to load is the judging criteria).

 

Requirements:  (Teams of 2 or may do by yourself)

    Materials (only):           

Wood, Any type. You may double with glue if desired (but no commercially lamented wood is allowed).                              

            Glue: Any type (should be instant drying)

            No paint, stain

 

  • Minimum Height of Tower: 35 cm

 

  • Base of tower must cover 20cm by 20cm hole

 

  • Top of tower must hold 4.5cm square metal platform where load is attached  to a bucket under the hole. Your top platform should be 4 cm by 4 cm.

 

  Maximum Load on tower: 22-kg

 

 

EC: If your tower holds the 22kg and its weight is less than

25g

 

 

 

 

 

2. Bridge Contest:

  • Due by Friday Jan 8th

 

 

 

Go over L#20 & L#21

 

Q (Energy required/leaving) = (mass)(DTemp)(Specific Heat)

 

 

 

Energy given off by a hot object = energy received by a colder object

 

(i.e., energy received by water = energy given off by a hot object)

Specific Heat H2O = 1 Cal  per 1g  for 10 C change of temp

 

Qwater = (mass H2O)(DTemp H2O)(Specific Heat H2O)

 

Qobj = (mass obj)(DTemp obj)(Specific Heat obj)

 

 

 

 

 

 

 

 

Start #21

 

 

1. A 20 N force acts on a body and its momentum changes by 80.0 kg m/s.  How long does the force act? 

a)       8.0 s

b)       4.0 s

c)       2.0 s

d)       1.0 s

e)       none of these

 

 

 

 

 

 

 

 

 

 

 

Impulse = change of Momentum

(force)(Dtime)     =   (mass)(Dvelocity)

(20)(Dt)   =  80 mo's

  Dt   =   4 sec

 

 

 

2. What is the recoil speed of a 4.0kg rifle that shoots a 0.05kg bullet at a speed of 289m/s?

 

 

 

 

 

 

 

 

 

 

 

 

mrVr = mbVb

4Vr = (.05)(289)

Vr = 3.62 m/s

 

 

 

 

3. A 10,000kg railroad car traveling at 24.0m/s strikes an identical car at rest. If the cars lock together as a result of a collision, what is the speed of the cars?

 

 

 

 

 

 

 

 

 

            Moi = Mof    (momentum is conserved)

            Moi = mV à  (10,000)(24) = 240,000 Mo’s

            Mof = (m1 + m2)Vf 

            à 240,000 Mo’s = (20,000)Vf

                à V = 12 m/s

 

     

 

L# 20: 1- 5, 7, 9 - 16   Due Today Friday 13 Nov

L# 21: 1,2, 4 - 6, 9-16   Due Monday 16 Nov

 

Wed or Thurs18th or 19th Debate on Energy

 

L# 22: 1- 5, 7- 9, 12, 14 - 20   Wed or Thurs18th or 19th

 

Friday 19 Nov Start Newton Demo Lab (Teams of 3)

Lab conducted on Fri/Mon & Paper & Lab book due Wed 25th

 

L# 23: 1-4, 8, 13, 15, 16, 18, 20   Due Wed 25 Nov

 

Review for test on Mon 30 Nov

 

Test Wed L# 19 - 23  Tues Dec 1st