vb.net barcode scanner tutorial Weight of 5 ft3 of hydrogen Lift 5 (0.0058) 0.029 lb 0.4035 lb 0.029 lb 0.3745 lb in Android

Drawer Universal Product Code version A in Android Weight of 5 ft3 of hydrogen Lift 5 (0.0058) 0.029 lb 0.4035 lb 0.029 lb 0.3745 lb

Weight of 5 ft3 of hydrogen Lift 5 (0.0058) 0.029 lb 0.4035 lb 0.029 lb 0.3745 lb
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The difference in lift for a 5-ft3 balloon is
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0.3745 lb 0.3485 lb 0.026 lb, about 1/2 oz
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Because the difference in lift is small, it is not worth the added risk of using hydrogen gas! I recommend using helium gas only.
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The piece of Mylar used to make a balloon after it s folded in half, lying down flat, measures 34" 56". The weight of the material is 3 oz (0.1875 lb). It s difficult to estimate how much helium the balloon will hold. To make a rough estimate, I use the volume of a cylinder. I know a pillow shape is not a cylinder, but, like I said, it s a rough estimate. First find the diameter. The material is 34" 2 equaling 68" for the circumference. The circumference of a circle is 2 times pi (3.14) times the radius. If you do the math, the radius works out to 11". The volume of a cylinder equals pi times the radius squared times the height. The height in this case is 56". If you do the math, the volume equals about 12 ft3. The balloon will not be filled to its maximum capacity. In this case I d estimate the balloon will hold about 70 percent of the calculated volume or about 8.4 ft3 of helium gas.
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Calculated lift
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Weight of air Weight of helium Weight of Mylar material Lift 8.4 (0.0807 lb/ft3) 8.4 (0.0110 lb/ft
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0.678 lb 0.0924 lb 0.1875 0.398 lb,
3 oz, or 0.1875 lb 0.678 0.0924 or 6.37 oz
Construction
Construction of the blimp is simple and straightforward. Essential to the construction is being able to make a good heat seal. Cut a small section of Mylar material from the large sheet to practice on. Fold the small section of Mylar, shiny sides to the outside, dull sides together. Set the iron to a medium heat setting. Keep adjusting and testing the heat setting of the iron on small Mylar practice scraps until you find the right temperature. Every time you adjust the temperature of the iron, allow at least 5 minutes for the iron to stabilize to the new temperature. If the temperature setting is too hot, the Mylar material will melt and create holes. If the temperature setting is too cold, the heat seal will pull apart too easily. A good heat seal will not pull apart easily. Allow the Mylar material to cool for a minute before you test the heat-sealed seam. Once you have found the right temperature setting, write it down for future reference. We will make a pillow-shaped blimp. Fold the sheet of Mylar material in half (shiny side out). Heat seal the three open sides closed, leaving a little space that isn t heat sealed for a fill tube at the bottom, and you re finished. The heat-sealed seam should be 1/2" to 1" wide.
CCD camera
The CCD camera provides the video from the blimp (see Fig. 14.3). Naturally, weight is a consideration. This camera weighs a little 1 1/ 4" 11/8". Light over half an ounce. The overall size is 11/4" sensitivity is 0.03 lux. Resolution is 430 TV lines. Output video is a standard NTSC (1V pp) signal. The camera can be powered from 9 to 12 volts direct current (VDC) maximum. The current draw from the camera is approximately 100 milliamps (mA). A 9V transistor battery can power the camera. The battery weight (1.5 oz) is three times greater than the weight of the camera itself.
TV transmitter
There are a number of TV transmitter kits available. There are two basic classes of transmitters. One type transmits the video and audio
fourteen
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on one of the standard TV channels. The TV s tuner picks up the signal and displays it. These transmitters have a limited range of a few hundred feet. The second type is more expensive. This type transmits well above TV frequencies into the 900-megahertz (MHz) range, and the TV requires a down converter to display the video. The down converter receives the 900-MHz signal and down converts it to a standard TV frequency. These units have a much greater range and better fidelity. The unit used in this prototype transmits directly to a TV set on its VHF (Channel 14) channels (see Fig. 14.4).
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