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erma4kov [3.2K]
3 years ago
5

Insulators are materials that reduce heat flow. Nature uses many types of insulation to protect animals from losing too much hea

t. Blubber, feathers, and hair all help animals retain body heat. Animals often insulate their homes with wood chips, grass, and even shredded newspaper and bits of cloth. Humans have also had to find ways of insulating ourselves from the cold. In past times, homes were constructed with thick walls to protect against heat loss. Today, materials such as fiberglass and foam are often incorporated into walls and floors for insulation. In this activity, you will compare the heat-retaining ability of several insulators.
OBJECTIVES
Build and use a calorimeter to measure rate of heat loss.
Analyze data using comparative graphs.
In this experiment, you will be using a “coffee cup” calorimeter to measure the rate of heat loss for several substances and determining which of the substances is the best insulator. You will be testing the insulating capabilities of three types of fabric and the control will be air. The three types of fabric are:

Test Sample 1: 52% cotton/48% poly fabric
Test Sample 2: 100% acrylic fabric
Test Sample 3: 80% cotton/20% poly fabric
For the control, and each test sample, you will be measuring the amount of heat lost by the water in the calorimeter over 6 minutes, taking the temperature every 30 seconds. Be sure to record your data on your data sheet . View the animation to complete this experiment.

Answering the following questions will help you to focus on the outcomes of these experiments: Construct a graph of temperature versus time. Put temperature on the y-axis and time on the x-axis. Graph all three sets of data on the same graph. Use a different colored pencil for each test material. Provide a key on the graph relating the pencil color to the test material. Calculate the change in temperature from start to finish for the air and each of the samples and record on your data sheet. Which water sample lost the least amount of heat energy over the 6-minute time interval? Was the rate of heat loss constant during each experiment? How can you tell? Which material was the best insulator? Which material was the least effective insulator? Write a summary paragraph discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph. According to your data, was your hypothesis correct? (Be sure to refer to your data and graphs when answering this question.) Summarize the conclusions that you can draw from this experiment. Use the questions above to guide your ideas. Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems. Explain why the design of the bird's nest in the picture provides good insulation for the eggs. Submit your data sheet, graph, and answers to all of the questions in the essay box below.

Physics
1 answer:
katrin2010 [14]3 years ago
6 0

Answer:

This has all the answer (Data sheet, graph, answers to the questions, and the summary) :)

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A student examines a 20-meter long rectangular stream channel and takes the following measurements: width of stream = 4 meters,
Scrat [10]

Answer:

The discharge of the stream at this location is 40 cubic meters per second.

Explanation:

The discharge is the volume flow rate of the water in the stream. For this purpose we can use the following formula:

Discharge = Volume Flow Rate = (Cross-Sectional Area)(Velocity of Stream)

Volume Flow Rate = (Width of Stream)(Depth of Stream)(Velocity of Stream)

Volume Flow Rate = (4 meters)(2 meters)(5 meters per second)

<u>Volume Flow Rate = 40 cubic meters per second</u>

Therefore, the discharge of the stream at this location is found to be <u>40 cubic meters per second</u>

This result shows that 40 cubic meters volume of water passes or discharges through this point in a time of one second. Hence, this is called the volume flow rate or the discharge of the stream.

3 0
3 years ago
In a low-density cloud, the internal pressure is much too low to support the weight, so the cloud must __________, eventually pr
andrey2020 [161]

The answer to this question is flatten

so the cloud must <u>flatten</u> eventually producing the galaxy s disk.

3 0
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Which of the following is a terrestrial habitat?<br>A) Pond B) Garden C) Lake D) River​
kenny6666 [7]

Answer:

garden

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3 years ago
If a blender is plugged into a 168 V outlet that supplies 80.8 A of current, what amount of
VladimirAG [237]

Answer:

Power = 13.5744 kilowatts

Explanation:

Power is the rate at which work is done. ... Great power means a large amount of work or energy developed in a short time. For example, when a powerful car accelerates rapidly, it does a large amount of work and consumes a large amount of fuel in a short time.

Formula for power = work/time

= IVT/T

= IV

Where I is the current

And V is the voltage

The voltage V supply = 168 v

The current A supply = 80.8 A

Power = 80.8*168

Power = 13574.4 watts

Power = 13.5744 kilowatts

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3 years ago
Which of the following statements is true about earth's magnetic poles
Dahasolnce [82]

Answer: b) they are the areas where Earth's magnetic field is weakest

Explanation:

According to classical physics, a magnetic field always has two associated magnetic poles (north and south), the same happens with magnets. This is because for <em>classical physics</em>, naturally, magnetic monopoles can not exist.  

In this context, Earth is similar to a magnetic bar with a north pole and a south pole. This means, the axis that crosses the Earth from pole to pole is like a big magnet.  

Now, by convention, on all magnets the north pole is where the magnetic lines of force leave the magnet and the south pole is where the magnetic lines of force enter the magnet.  Then, for the case of the Earth, the north pole of the magnet is located towards the geographic south pole and the south pole of the magnet is near the geographic north pole.  

Being the magnetic poles the places where the Earth's magnetic field is weakest. And it is for this reason, moreover, that the magnetic field lines enter the Earth through its magnetic south pole (which is the geographic north pole).

4 0
4 years ago
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