Wednesday, October 29, 2014
Tuesday, October 21, 2014
10/21 Chemistry update and homework due 10/28
Hi folks,
Today we took a look at the five phases of matter, phase change and the relationship between heat, temperature and phase change.
Homework this week is to:
Answer the following questions
Do the enclosed worksheet .pdf.
Create a temperature vs. time graph of your data from the lab this week. Please put both the oil and the water on the same graph. Feel free to have your temperature axis go from 90℉ to 130℉ (instead of 0 - 130)
1. What are the five phases of matter?
2. Describe what happens, molecularly, as a solid increases in temperature and changes phases. Be sure to include a description of the bonds and how they change over the process. Also, what would temperature be doing over time as this substance changed temperature.
3. List the states of matter from least amount of kinetic energy to greatest amount of kinetic energy.
4.
Today we took a look at the five phases of matter, phase change and the relationship between heat, temperature and phase change.
Homework this week is to:
Answer the following questions
Do the enclosed worksheet .pdf.
Create a temperature vs. time graph of your data from the lab this week. Please put both the oil and the water on the same graph. Feel free to have your temperature axis go from 90℉ to 130℉ (instead of 0 - 130)
1. What are the five phases of matter?
2. Describe what happens, molecularly, as a solid increases in temperature and changes phases. Be sure to include a description of the bonds and how they change over the process. Also, what would temperature be doing over time as this substance changed temperature.
3. List the states of matter from least amount of kinetic energy to greatest amount of kinetic energy.
4.
Thursday, October 16, 2014
Wednesday, October 15, 2014
10/14 Chemistry update and homework due 10/21
Hi folks,
Today we began a new unit on heat and temperature. To get the ball rolling, we spent time talking about what temperature is, and the three ways to measure it. We also did a lab where we heated water from solid form to liquid form and recorded the temperature every 30 seconds. Due to timing and power issues the data didn't turn out as "clean" as I would have liked so I've created a data table for this week's lab and included it below.
For homework this week:
Complete the enclosed .pdf.
Use the included data table to create a graph that relates to the lab we did in class. Label the graph with the "notes" I've included in the table.
Today we began a new unit on heat and temperature. To get the ball rolling, we spent time talking about what temperature is, and the three ways to measure it. We also did a lab where we heated water from solid form to liquid form and recorded the temperature every 30 seconds. Due to timing and power issues the data didn't turn out as "clean" as I would have liked so I've created a data table for this week's lab and included it below.
For homework this week:
Complete the enclosed .pdf.
Use the included data table to create a graph that relates to the lab we did in class. Label the graph with the "notes" I've included in the table.
Sunday, October 12, 2014
Thursday, October 9, 2014
10/7 Chemistry update and homework due 10/14
Hi folks,
We did a bit more work with the basics of energy today. Specifically, taking a look at conservation of energy and energy efficiency. We did a lab to evaluate the energy efficiency of a pendulum.
The book really doesn't go into enough detail as far as the basics of energy goes, so I'm including an eBook version of my Bite-Size Physics: Energy book for more background.
Homework this week is to:
1. Read the enclosed eBook up to the Vibrations chapter.
2. Do the "Did you Get it" questions at the end of the Energy chapter.
3. Do the "Did you Get it" and the "A Little Math" questions at the end of the Kinetic and Potential Energy chapter.
4. Finish the lab from class. You should have the potential energy from each swing, the potential energy lost after each swing, the energy efficiency of each swing and, lastly, an overall energy efficiency average.
We did a bit more work with the basics of energy today. Specifically, taking a look at conservation of energy and energy efficiency. We did a lab to evaluate the energy efficiency of a pendulum.
The book really doesn't go into enough detail as far as the basics of energy goes, so I'm including an eBook version of my Bite-Size Physics: Energy book for more background.
Homework this week is to:
1. Read the enclosed eBook up to the Vibrations chapter.
2. Do the "Did you Get it" questions at the end of the Energy chapter.
3. Do the "Did you Get it" and the "A Little Math" questions at the end of the Kinetic and Potential Energy chapter.
4. Finish the lab from class. You should have the potential energy from each swing, the potential energy lost after each swing, the energy efficiency of each swing and, lastly, an overall energy efficiency average.
Monday, October 6, 2014
Answers for this week's homework
Hi folks,
Several folks have emailed me indicating that they are not quite sure if they are getting it for this week's homework. Here are the answers to the math problems. Be sure to do the problems FIRST before looking at the answers. Also, if you get it wrong, redo the problem and be sure you know how to do it. This material will be quizzed on so be like a Boy Scout and "Be Prepared". :)
1. 400x2=800 joules (100lbx4=400 newtons)
1 calorie= 4.184 joules
1 Joule = .2389 calories
800x .2389 = 191.12
3. 40x400 = 16000 joules
.2389x16000 = 3822 calories
4. 1.3x10^8 = 130,000,000/400 = 325000 meters
7. 10,000 = F x 4
F = 2500N
Several folks have emailed me indicating that they are not quite sure if they are getting it for this week's homework. Here are the answers to the math problems. Be sure to do the problems FIRST before looking at the answers. Also, if you get it wrong, redo the problem and be sure you know how to do it. This material will be quizzed on so be like a Boy Scout and "Be Prepared". :)
1. 400x2=800 joules (100lbx4=400 newtons)
1 calorie= 4.184 joules
1 Joule = .2389 calories
800x .2389 = 191.12
3. 40x400 = 16000 joules
.2389x16000 = 3822 calories
4. 1.3x10^8 = 130,000,000/400 = 325000 meters
7. 10,000 = F x 4
F = 2500N
Thursday, October 2, 2014
Wednesday, October 1, 2014
10/1 Chemistry update and homework due 10/8
Hi folks,
Today we did a quick overall look at the concept of energy. We will be dealing with the concept of energy a lot throughout this class and today's lecture was meant to give an nice overall background regarding what energy is and what it does.
Homework for this week:
Read the content on this website up to the section on Power.
Answer the following questions.
1. How many Joules would it take to walk up a 2 meter (about 6 feet) flight of stairs if you weigh 100 lbs? (Remember to convert to Newtons. One Newton is equal to 4 lbs so multiply the weight by 4.) How many calories would that be? How many times would you have to walk up (remember down doesn't count) that flight of stairs to burn off the Calories from a Snickers bar (250 Calories (remember that's 250,000 calories))? The formula for work is W=FD.
2. Why doesn't down count in the above problem?
3. If it takes about 40 Newtons of force to push a lawn mower and you push it 400 meters to cover the entire lawn, how much work do you do? In Joules? In calories?
4. A gallon of gas has 1.3x10^8 J of energy. (that carrot means that the 8 is an exponent. So the number is 1.3 x 10 to the 8th.) How far can a car go if it takes 400 N of force to keep it going?
5. What is potential energy? Give 3 examples.
6. What is kinetic energy? Give 3 examples.
7. If it takes 10,000 J of energy to push a refrigerator 4 m (12 ish ft.) across a kitchen what force does it take to push that fridge?
8. Look up 3 of your favorite activities and tell me how many Calories it takes to do them? How many Joules would that be?
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