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nikdorinn [45]
2 years ago
9

Help me with this problems please

SAT
1 answer:
zheka24 [161]2 years ago
5 0

Answer:

the first one is 39

and second 27

hope that helps

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Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. (2) A greenhouse stays warm
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The topic sentence is the first sentence. It defines what the rest of the paragraph will be. <span />
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Which of the following represents a job done by an agricultural engineer?
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Agricultural engineers have a variety of tasks, including giving answers to agricultural-related difficulties, as well as the usage of structures and infrastructure.

<h3>What does an agricultural engineer do?</h3>

Agricultural engineering, commonly referred to as agricultural and biosystems engineering, is the study and application of engineering science and design concepts to agriculture.

An agricultural engineer is a professional engineer with a background in agriculture. Agricultural engineers develop and plan the engineering for an agricultural project, generally in collaboration with an agriculturist who is more knowledgeable in farming and agricultural science.

Thus, some of the jobs of agricultural engineers are, addressing concerns with power sources, machine efficiency, building, and facility utilization, pollution, and environmental challenges.

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which event motivated the opposing parties of china to fight together? in 1931, the invasion of manchuria persuaded the chinese
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In 1931, the Japan invasion of Manchuria persuaded the Chinese Communist Party and the warlords to unite with the Kuomintang.

<h3>What was the effect of Communism?</h3>

In the year 1931, Japan invaded Manchuria immediately after the Mukeden incident and then installed Manchuko state.

This invasion by the Japanese army on Manchuria was because they felt that a Chinese lieutenant destroyed the South Manchuria Railway by a detonating dynamite.

The imperial Japanese army responded with a full invasion which caused a truce between the Kuomintang and communist party of china,  they cooperated against the Japan.

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IMPORTANT PLEASE HELP
lbvjy [14]

Answer:

Answer A

Explanation:

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Newton’s law of cooling states that for a cooling substance with initial temperature t0, the temperature t(t) after t minutes ca
antoniya [11.8K]

The cooling rate of the substance is approximately 0.0732.

According to the statement, the Newton's law of cooling is defined by the following formula:

T(t) = T_{s} + (T_{o}-T_{s})\cdot e^{-k\cdot t} (1)

Where:

  • T_{s} - Final temperature, in degrees Celsius.
  • T_{o} - Initial temperature, in degrees Celsius.
  • t - Time, in minutes.
  • k - Cooling rate, in \frac{1}{min}.
  • T(t) - Current temperature, in degrees Celsius.

Please notice that substance reaches thermal equilibrium when T(t) = T_{s}, that is when temperature of the substance is equal to the temperature of surrounding air.

If we know that T_{o} = 80\,^{\circ}C, t = 15\,min, T_{s} = 50\,^{\circ}C and T(15) = 60\,^{\circ}C, then the cooling rate of the substance is:

60 = 50 + (80 - 50)\cdot e^{-15\cdot k}

\frac{60-50}{80-50}= e^{-15\cdot k}

\frac{1}{3} = e^{-15\cdot k}

k = -\frac{1}{15}\cdot \ln \frac{1}{3}

k \approx 0.0732

The cooling rate of the substance is approximately 0.0732.

To learn more on Newton's law of cooling, we kindly invite to check this verified question: brainly.com/question/13748261

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