Can Anyone Help Me with This Comparative Advantage Question for Micro Econ?

Aruba can make 1 radio in 5 hrs and a cooler in 2 That means the opportunity cost (OC) for Aruba to make another cooler is going to be 2/5 = .4 radios. The OC for Iceland to make another cooler is 1/4 = .25. There is a lower opportunity cost for Iceland to make more coolers OC for Aruba to make another radio instead of cooler: 2.5 OC for Iceland to make another radio instead of cooler: 4 There is a lower opportunity cost for Aruba to make more radios. So if Aruba makes only radios, they can make: 8 If Iceland makes only coolers, they can make 40 Then they can trade them If they do it on their own:Iceland makes 20 coolers (40/2 = 20, 20/1 =20) and Aruba makes 10 coolers(40/2 = 20, 20/2 = 10), which adds up to 30 total. That means that 10 more coolers get made with trade using comparative advantage than if they did it on their own.

Can Anyone Help Me with This Comparative Advantage Question for Micro Econ? 1

1. Rectification of Micro DC voltage levels?

That wo not work. It may detect ion flows and AC fields above a certain frequency, but it can not detect DC fields. After all, the plates constitute a coupling capacitor in series with the fields you want to detect. It's a high-pass filter.The usual instrument for this is called a "field mill," where the detector plate is placed close behind a grounded metal propeller or rotating "sector disk. " The rotating disk chops any DC e-fields into low-freq AC, which is easily amplified/rectified/A-toD would etc. Perhaps even use low-pass filtering and a synchronous detector to reject any unwanted AC.DIY e-field sensor field mill from Scientific American: Jul '99 The Amateur ScientistMore electrometer and Field Mill linksBesides "field mill," also search for "Electrometer"Antenna without the field mill: if your detector plate is 10 picofarad, and the amplifier's input is MOSFET with 100 giga-ohm Z-inp, then you've formed a high-pass filter which rejects all DC below 1Hz (since RC is 1e11ohm * 1e-11farad) It's possible to use a much higher-Z amplifier, plus a periodic shorting relay that "resets" the detector's input before taking data. But then usually you will run into unknown humidity leakage across plastic insulators, and a (drifting) high-pass period of ?tens? of seconds. Better to just add a field mill, and measure true DC fields.(edit) PS. Here's something I've not tried: just build a non-fieldmill e-field antenna with well-known RC time constant of perhaps a few seconds, use high-res A/D input, then massage the numbers to cancel out the RC and restore the DC value. Of course this includes a stage of integration, so any slight errors in zero-adjust would produce a constantly increasing drift. The amplifier's DC-zero would need to be extremely stable across the environmental temperature changes involved

2. Sandisk Cruzer Micro USB flash drive and Macs..?

Usually there is no problem with USB memory sticks on a Mac

Can Anyone Help Me with This Comparative Advantage Question for Micro Econ? 2

3. Is it possible to use micro-sprinklers to irrigate the lawn?

They make special sprinkler nozzles for dealing with narrow strips. They are called end strip and side strip. They have a more or less rectangular spray pattern. All major manufacturer's I've seen have them and they are designed to provide the same precipitation rate as other sprinkler nozzles in the same line so you can keep them on the same zone provided they design and spacing is correct. Irrigation Tutorials indicates the side strips have a better pattern than the end strips.Update:Ok, now I understand. There's reasons that irrigation designers separate shrub and lawn areas. They have different irrigation needs.Most drip line and drip emitters (which you said you would like to combine) need to run at a lower pressure than sprays. The micro sprays you are talking about will function at lower PSI but the radius is going to be less. To get even head to head coverage in your 19'x10' area you are going to need 6 spray heads. One 90deg on each corner and 1 180deg in the middle of each 19' side. That's provided you can get 10' radius out of them at the pressure you are running the system at. You said specs indicated you can only get 4 on a line to run at a time. If you do not have 6 you are going to have a dry spot in the center of the lawn area. Go through the irrigation tutorial link I sent if you are serious about trying this. It shows you how to do all the calculations. There are a lot of factors that go into this. You have the specs for the devices you would like to use. Do the math and see if it works out. If you planned out the drip area you should know what pressure it's going to run at. You will need a pressure reducing fitting in most cases. From what I remember most of his examples use 3/4" or 1" main lines but if you can find the appropriate specs for the 1/2" line you can use the same formulas.Regarding grass height, as long as the streams of water are high enough so that they do not get blocked by the grass you should be fine. I would be more worried about mowing around the sprinklers without damaging them.

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