2 years ago

Help me this is for my important homework

Mathematics

1 answer:

djyliett [7]2 years ago

7 0

Answer:

Step-by-step explanation:

F = 1.8c + 32

F = 1.8(15) + 32

F = 27+32

F = 59

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2 years ago

A detective finds a victim of murder at 9 am. At that time, the temperature of the body is 90.3 degrees F. One hour later, the b

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Answer:

Step-by-step explanation:

Given

at 9 am temperature of the body is $90.3^{\circ}F$

1 hr later temperature $89^{\circ}F$

Temperature of room $T=68^{\circ}F$

According to newtons law

$\frac{\mathrm{d} T}{\mathrm{d} t}=-k\left ( T-T_{room}\right )$

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$=\int \frac{dT}{T-68}=-kdt$

$\ln |T-68|=-kt+c$

$T-68=Ae^{-kt}$

Now at 9 am i.e. t=0,

$90.3=A+68$

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At 10 am i.e. t=1 hr T=89

$89-68=22.3e^{-k}$

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$98.6-68=e^{-0.06006t}$

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$t=-5.27$

i.e. 5 hr and 16.2 min

i.e. victim murdered at 3 am and 43.8 min

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3 years ago