Coffee-can "Astronaut". (Hands-On Activity).In space there is no temperature to speak of, because there are no gas molecules. Yet objects traveling in space can become extremely hot or cold, depending on how an object absorbs or radiates heat from the sun. One way to protect astronauts from such extremes is the use of materials with the most desirable thermal (to keep warm) and insulating (to protect from cold) properties. This experiment investigates how different colors, surfaces, and materials affect an object's ability to absorb and radiate ra·di·ate v. 1. To spread out in all directions from a center. 2. To emit or be emitted as radiation. ra heat. YOU NEED: 4 coffee cans with plastic lids * thermometers * paint in white, black, green, and yellow * materials for "spacesuit layers": foil, construction paper, variety of cloth * timer timer, n radiographic timing device that functions as an automatic exposure timer and a switch to control the current to the high-tension transformer and filament transformer. The face of the timer is calibrated in seconds and fractions of seconds. * freezer freezer the compartment in which meat and offal are stored at freezing temperatures of 10 to 16°F (-12 to -9°C) although there is a trend to lower temperatures of 0 to -22°F (-18 to -30°C). or tub of ice water * flood lamp * pencil * paper TO DO: 1. Paint the outside of each coffee can a different color--white, black, green, and yellow. 2. Carefully punch a small hole in the center of the plastic lid. Insert a thermometer thermometer, instrument for measuring temperature. Galileo and Sanctorius devised thermometers consisting essentially of a bulb with a tubular projection, the open end of which was immersed in a liquid. to the middle of the can. 3. Place the cans under equal exposure of sunlight. Use a floodlight if you conduct the experiment indoors. 4. Measure and record the temperature of each can every minute for 10 minutes. 5. Remove the cans from the heat of the sun or floodlight and place them in room temperature. 6. Continue measuring and recording the temperature of each can every minute for 10 minutes. 7. Wrap cans with your "spacesuit." Experiment with different combinations of materials and number of layers. Keep repeating Steps 3-6. 8. Repeat the above exercise, but this time put the cans in a freezer or tub of ice water (do not let water seep into the can). 9. Turn your data into graphs and charts (See SW 9/17/01, p. 18.) CONCLUSION: Which combination of color not of the white race; - commonly meaning, esp. in the United States, of negro blood, pure or mixed. See also: Color and materials provided the best protection for the coffee-can "astronaut astronaut, crew member on a U.S. manned spaceflight mission; the Soviet term is cosmonaut. Candidates for manned spaceflight are carefully screened to meet the highest physical and mental standards, and they undergo rigorous training. "? Why? Which combination is the worst? Why? DON'T don't 1. Contraction of do not. 2. Nonstandard Contraction of does not. n. A statement of what should not be done: a list of the dos and don'ts. STOP NOW! What do cosmonauts wear? How do their spacesuits differ from American gear? |
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