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3 years ago

What is 5(5r-7)=-185

Mathematics

1 answer:

Alex3 years ago

6 0

5(5r-7)=-185
25r - 35 = - 185
25r = - 150
r = - 6

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When an amount of heat Q (in kcal) is added to a unit mass (kg) of a

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Answer:

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Step-by-step explanation:

The given parameters of the question are;

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Given that both dQ/dT and dQ/dt are known, we have;

$\dfrac{dQ}{dT} = 0.18 \, (kcal/ ^{\circ} C)$

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Therefore, we get;

$\dfrac{\dfrac{dQ}{dt} }{\dfrac{dQ}{dT} } = {\dfrac{dQ}{dt} } \times \dfrac{dT}{dQ} = \dfrac{dT}{dt}$

$\dfrac{dT}{dt} = \dfrac{\dfrac{dQ}{dt} }{\dfrac{dQ}{dT} } = \dfrac{12.9 \, kcal / min }{0.18 \, kcal/ ^{\circ} C } = 71.\overline 6 \, ^{\circ } C/min$

For the sample, we have the change in temperature per minute, dT/dt, presented as follows;

$\dfrac{dT}{dt} = 71.\overline 6 \, ^{\circ } C/min$

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2 years ago

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