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2 years ago

In the past two decades, the number of teenage pregnancies has

SAT

1 answer:

Levart [38]2 years ago

4 0

In the past two decades, the number of teenage pregnancies has dropped dramatically across all ethnic groups.

<h3>Why has teenage pregnancies has dropped dramatically across all ethnic groups?</h3>

The teenage pregnancies has dropped dramatically across all ethnic groups because of the education , there are alot of parents that are now educated to educate their children about danger of teenage pregnancies.

Also, there has been increased in protective measure by the government to reduce teenage pregnancies, hence, In the past two decades, the number of teenage pregnancies has dropped dramatically across all ethnic groups.

Learn more about teenage pregnancies on:

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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

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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: