Earths atmosphere contains 4 times as much nitrogen as oxygen
What is the atmosphere made of?Earth's atmosphere contains about 78% nitrogen gas (N2) by volume, which is approximately four times the amount of oxygen gas (O2) in the atmosphere.
Oxygen makes up only about 21% of the atmosphere. Therefore, nitrogen gas is the most abundant gas in Earth's atmosphere, with oxygen being the second most abundant. Other gases such as argon, carbon dioxide, neon, helium, and methane make up the remaining small fraction of Earth's atmosphere.
The relative proportions of these gases in the atmosphere play a critical role in regulating Earth's climate and weather patterns, as well as supporting life on the planet. Nitrogen is an essential element for life and is a key component of proteins and nucleic acids, which are the building blocks of all living organisms.
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PLEASE HELP!!!! This is do today
A)
According to the cartoon, trickle down economics looks perfect and ideal in theory.According to the cartoon, trickle down economics is problematic and in practice.The author of the cartoon would disagree with the given statement.B)
The graph is analyzing family income growth.The period is 1980-1990.It has 8 income groupsThe last one with 73.9%It means that those in that class are in debt.What is trickle down economics?Trickle-down economics is an economic theory that suggests tax cuts and benefits for the wealthy and businesses will trickle down to the rest of society, creating economic growth for all.
Trickle-down economics remains a topic of debate today. Some argue that it leads to economic growth and job creation, while others criticize it for exacerbating income inequality and benefiting the wealthy at the expense of the middle and lower classes.
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What uses a high voltage/low current/high hertz arc to start and
stabilize the welding arc?
High frequency
Lift arc
Scratch start
Low frequency
High frequency is a high voltage, low current, and high hertz arc to start and stabilize the welding arc, hence option A is correct.
What is a high frequency arc welding?The process of connecting materials using a high frequency (HF) electromagnetic field (27.12 MHz) and pressure is known as high frequency (HF) or radio frequency (RF) welding.
The user can place the tungsten electrode close to the task at hand and spark the arc by just depressing the torch trigger. Professional TIG welding equipment with AC/DC functionality.
The high frequency function is disabled once your arc has begun until you are ready to restart it. With lift start, there is no arc jump between the tip of the tungsten and the metal. You still utilize your trigger or foot pedal.
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What feature of a thread is checked with a thread micrometer?
Crest radius
Root radius
Major diameter Pitch diameter
Minor diameter
The feature of a thread is checked with a thread micrometer are:
Major diameter
Pitch diameter
Minor diameter
What is the thread?A thread micrometer is a specialized measuring instrument used to measure the major diameter, minor diameter, and pitch diameter of external threads. The major diameter is the largest diameter of the thread, while the minor diameter is the smallest diameter of the thread. The pitch diameter is the diameter at which the width of the thread and the width of the space between the threads are equal.
The crest radius and root radius of a thread are not typically checked with a thread micrometer. These measurements are instead checked using specialized measuring instruments known as thread profile gauges, which are designed to measure the shape and size of the thread's crest and root.
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A culture of bacteria has an initial population of 94000 bacteria and doubles every 10 hours. Using the formula P t =P 0 ⋅2 d t , where P t is the population after t hours, P 0 is the initial population, t is the time in hours and d is the doubling time, what is the population of bacteria in the culture after 13 hours, to the nearest whole number?
The population is modeled by the exponential equation:
P(x) = 94,000*(2)^(x/10)
And the population after 13 hours is 231,455 bacteria.
What is the population after 13 hours?The population can be modeled with an exponential equation of the form:
P(x) = A*(b)^x
Where A is the initial population, b defines the rate of growth/decay, and x represents the time.
Here the initial population is 94,000 bacteria, and it doubles every 10 hours, then we can write the exponential equation as:
P(x) = 94,000*(2)^(x/10)
Notice that there is a 1/10 factor in the exponent because the doubling thing happens every 10 hours, then the population after 13 hours is:
P(13) =94,000*(2)^(13/10) = 231,455 bacteria.
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