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Natali [406]
3 years ago
8

11) We are past the year 1990: A.) Observation B.) Inference

Physics
2 answers:
Sliva [168]3 years ago
7 0
A an observation hehdhhdhdhdhdhhdhdhdhdhdb
Genrish500 [490]3 years ago
6 0

a would be the answer cuz u for sure know were passed 1990 u can see that its 2019

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I lost 1 point on this and I don’t know what I did wrong.
Viktor [21]

Answer:

i think its because u gave the almost every answer the same exact thing. all the questions have different ways of moving which means different forces for each one i hope this helps :)

Explanation:

4 0
3 years ago
Read 2 more answers
A microwave oven operates at 2.00 ghz . what is the wavelength of the radiation produced by this appliance? express the waveleng
yan [13]
<span>Since frequency and wavelength have inverse relationship. It can be expressed by the equation: ν.λ = c Where, v = frequency of the electromagnetic wave. λ = it's wavelength c = the speed of light in a vacuum. v = 2.00 Ghz x 10^9 Hz / 1 Ghz = 2.00 x 10^9 Hz that means that in one second it covers 2.00 x 10^9 cycles. λ = 3.10^8 m/s / 2.00 x 10^9 /s = 1.25E-10 nanometers</span>
7 0
4 years ago
Ask Your Teacher Two long, straight wires are parallel and 11 cm apart. One carries a current of 2.9 A, the other a current of 5
dsp73

Answer:

The magnitude of force per unit length of one wire on the other is 2.7945\times 10^{-5}\ N and the direction is away from one another

The magnitude of force per unit length of one wire on the other is 2.7945\times 10^{-5}\ N and the direction is towards each other.

Explanation:

\mu_0 = Vacuum permeability = 4\pi\times 10^{-7}\ N/A^2

i_1 = Current in first wire = 2.9 A

i_2 = Current in second wire = 5.3 A

r = Gap between the wires = 11 cm

Force per unit length

F_{12}=F_{21}=\frac{\mu_0 i_1i_2}{2\pi r}\\ =\frac{4\pi\times 10^{-7}\times 2.9\times 5.3}{2\pi 0.11}\\ =2.7945\times 10^{-5}\ N

The magnitude of force per unit length of one wire on the other is 2.7945\times 10^{-5}\ N and the direction is away from one another

F_{12}=F_{21}=\frac{\mu_0 i_1i_2}{2\pi r}\\ =\frac{4\pi\times 10^{-7}\times 2.9\times 5.3}{2\pi 0.11}\\ =2.7945\times 10^{-5}\ N

The magnitude of force per unit length of one wire on the other is 2.7945\times 10^{-5}\ N and the direction is towards each other.

7 0
3 years ago
Hi
Vera_Pavlovna [14]

1) the cotton bolls burst open, and the white cotton fiber can be seen. Ginning: The cotton picked up from the plants has seeds in it. The process of removing cotton seeds from pods is called ginning. Ginning was traditionally done by hand.

2) Preparation

To be used for thread or fabric, raw seed cotton must cleaned and free of debris. Seeds, burrs, dirt, stems and leaf material are removed from the cotton during ginning.

Module feeders break the modules apart and feed the cotton into the gin.

Some module feeders have giant conveyors moving the modules into stationary heads.

Other module feeders are self-propelled, moving down a track alongside the modules.

Once in the cotton gin, the seed cotton moves through dryers and through multiple cleaning machines that remove the gin waste such as burrs, dirt, stems and leaf material from the cotton. Once thoroughly clean and dry, the cotton goes to the gin stand where circular saws with small, sharp teeth pluck the fiber from the seed. This process makes the sliver smoother so more uniform yarns can be produced. Then the cotton is packed tightly into bales, ready to be processed into textiles.

Even though the cotton is cleaned during the ginning process, it's not nearly as clean as  it needs to be. Cotton fibers are shaved from the bales and sent through a series of cleaning and drying machines. The mixed and fluffed-up cotton goes into a carding machine which finishes the cleaning and straightening of the fibers, making them into a soft, untwisted rope called a sliver (pronounced sly-ver).

The sliver is drawn out to a thinner strand and given a slight twist to improve strength, then wound on bobbins (spools wound with the thread-like product for storage).  

It is now called roving and the roving bobbins are now ready for the spinning process.

Spinning

On modern spinning frames, yarn is mare directly from the sliver. The spinning devices take fibers from the sliver and rotate it up to 2,500 revolutions in a second twist that makes fibers into a yarn for weaving or knitting into fabrics.

Spinning is the last process in yarn manufacturing. Today's mills draw and twist the roving into yarn and place it on bobbins. They do this quite efficiently. A large, modern mill can produce enough yarn or thread in 30 days to wrap around the earth 2300 times or go to and return from the moon 235 times. With the use of automatic winding, the yarn bobbins are transferred to larger bobbins called cheese cones. These cheese cones can be stored until they are needed in the weaving process.

Weaving

Looms weave cotton yarns into fabrics the same way the first hand-weaving frames did. Modern looms work at great speeds, interlacing the length-wise yarns (warp) and the crosswise yarns (weft).

Warp refers to yarns that run lengthwise in woven goods. In preparation of warp yarns for weaving, hundreds of yarn strands are wound from cheese cones onto a large warp beam. Yarns on this beam are then coated with a starch mixture (sizing compound) to add strength for weaving.

Weft is the yarn that runs crosswise in woven goods and may be referred to as filling yarn. Sizing is not placed on weft because flexibility is needed in the weaving process.

In today's most modern mills, the weft is fed into the loom from cheese cones with air-jets at such a high speed that its movement cannot be seen.

The woven fabric, called gray goods, is sent to a finishing plant where it is bleached, pre-shrunk, dyed, printed and given a special finish before being made into clothing or products for the home. Other machines make knits for use in shirts, sweaters or blankets.

this website will help you: https://www.quilting-in-america.com/process-of-making-cotton.html

i hope this helps :)

6 0
3 years ago
Identify the machines in which both a lever and a wedge are used
disa [49]

the see-saw, and the catapult.

7 0
3 years ago
Read 2 more answers
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