Hands-on science (No Lab Required).After reading "Tricky Adrian Thaws (born January 27, 1968), better known as Tricky, is an English rapper and musician important in the trip hop and British music scene (despite loathing the "trip hop" tag). He is noted for a whispering lyrical style that is half-rapped, half-sung. Twisters" (p.18), try this activity. PREDICT: Can air pressure be powerful enough to push water up a straw straw, dried stalks of threshed grains, especially wheat, barley, oats, and rye. It has been used from antiquity for bedding, covering floors, and thatching roofs, as fodder and litter for animals, and in weaving such articles as mats, screens, baskets, ornaments and ? MATERIALS: modeling clay * drinking straw * metric ruler * scissors scissors Cutting instrument or tool consisting of a pair of opposed metal blades that meet and cut when the handles at their ends are brought together. Modern scissors are of two types: the more usual pivoted blades have a rivet or screw connection between the cutting ends * paper clip, with one end straightened * empty 20-ounce plastic, soda bottle * 10 marbles (jargon) marbles - (From the mainstream "lost his marbles") The minimum needed to build your way further up some hierarchy of tools or abstractions. After a bad system crash, you need to determine if the machine has enough marbles to come up on its own, or enough marbles to allow a or pennies * cold water * permanent marker A permanent marker is a type of marker pen that is used to create permanent writing on an object. Generally the liquid is water resistant, contains the toxic chemical xylene or toluene, and is capable of writing on a variety of surfaces from paper to metal to stone. * very warm water * plastic container, such as a bowl (2 liters, or 68 ounces) * pencil and paper pencil and paper - An archaic information storage and transmission device that works by depositing smears of graphite on bleached wood pulp. More recent developments in paper-based technology include improved "write-once" update devices which use tiny rolling heads similar to mouse DIRECTIDNS: 1 Break into groups of three students. 2 Roll a golf-ball-size piece of clay into a ball. 3 Push the top of a drinking straw through the middle of the clay ball until 15 centimeters (6 inches) of straw sticks out from the bottom of the clay. NOTE: If clay gets stuck in the top of the straw, cut off that portion of straw. 4 Make a pea-size ball out of clay and seal the top of the straw with it. 5 Make a small air hole in the clay ball that's at the top of the straw: Push the straightened end of a paper clip through the clay until you see the end of the clip emerge in the straw. Wiggle the clip a bit, then remove it. Set aside the clay-sealed straw. 6 Place 10 marbles into the empty soda bottle. 7 Pour 350 mL (1.5 cups) of cold water into the soda bottle. The water should cover the bottom 2.5 cm (1 in.) of the straw. NOTE: Test the water level by carefully placing the bottom end of the straw (the end without clay) into the bottle until the clay ball at the top of the straw hits the bottle's rim. Use a marker marker /mark·er/ (mahrk´er) something that identifies or that is used to identify. tumor marker to mark this water level on the bottle. 8 Place the straw into the soda bottle until the clay hits the bottle's rim. Press down on the clay to create a seal around the bottle's rim. 9 Fill a bowl (2 liters, or 68 ounces) 3/4 full with very warm water. Place the soda bottle into he warm-water bowl, until the portion of the bottle containing the water is submerged. 10 Observe for 10 minutes the level of the water in the bottom of the straw. Record observations. 11 With your hand, feel the outside of the soda bottle. Does the bottle feel warm or cool? Record. CONCLUSIONS: 1 From feeling the outside of the soda bottle, do you think the water inside warmed or cooled? Do you suppose the air in the soda bottle also changed temperature? Explain. 2 What happened to the water level in the straw? How could the air inside the soda bottle have caused the change in water level? (Hint: Warm air is less dense--and takes up more space--than cold air.) 3 Using what you learned in this activity and what you read in "Tricky Twisters," explain how the sun's heat could help spawn To launch another program from the current program. The child program is spawned from the parent program. (operating system) spawn - To create a child process in a multitasking operating system. E.g. a tornado tornado, dark, funnel-shaped cloud containing violently rotating air that develops below a heavy cumulonimbus cloud mass and extends toward the earth. The funnel twists about, rises and falls, and where it reaches the earth causes great destruction. . ANSWERS 1. The water inside the soda bottle should have been warmer. As the water inside the soda bottle heated up, it would also have heated up the air above it. 2. The water level in the straw should rise, Warm air is less dense, taking up more space, than cooler air. Since the air was trapped inside the bottle, as it heated up it pressed down on the water. That pressure caused the water to move up the straw. 3. The sun's heat would warm up surface air. Since warm air is less dense than cold air, the warm air would begin to rise. This rising air forms a cloud. The condensation within the cloud produces warming critical to sustain a thunderstorm thunderstorm, violent, local atmospheric disturbance accompanied by lightning, thunder, and heavy rain, often by strong gusts of wind, and sometimes by hail. , possibly forming a tornado. |
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