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Lapatulllka [165]

3 years ago

12

Which of the following offers students a group of courses to be taught over a couple of years?

2 answers:

Nikolay [14]3 years ago

7 0

IB does this. The IB plans out a students high school courses over at least 2 years. Trust me, I'm in it! Hope that helps!

Veronika [31]3 years ago

7 0

the IB is ur answer for the question.

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Which religion is being described in this passage? "This religion, which emphasizes detachment from worldly goods, originated in

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Buddhism

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Thea is giving a speech on the global HIV epidemic and would like to incorporate some testimony to lend credibility to her claim

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C? Least useful information, and includes an opinion, both uncomforting and personal.

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A charge moves from point a to point b in an electric field. what is true about the potential energy of the charge?

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It has a positive value.

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2 years ago

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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2 years ago

Do you think the earth is round or flat

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cube

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