Physics, 17.10.2019 05:30 preachersgirl5

How much heat is absorbed by 54g iron skillet when its temperature rises from 14°c to 28°c

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Answer from: reagan23b

Approximately 340.2 joules.

Explanation:

The specific heat capacity of a substance gives the amount of heat required to raise the temperature of unit mass of that substance by unit temperature. Look up the specific heat capacity of iron in a thermodynamic data sheet.

$c(\text{Iron})\approx \rm 0.450 \; J \cdot g^{-1} \cdot {^{\circ}C}^{-1}$ , where

$\rm J$ (joule) is the unit for heat/energy, $\rm g$ (gram) is the unit for mass, and $\rm ^{\circ}C}$ degree celsius is the unit for temperature.

In other words, it takes approximately $\rm 0.450\; J$ of energy to raise the temperature of one gram of iron by one degree celsius.

In this question,

$\Delta T = 28 - 14 = \rm 14\;^{\circ}C}$ .

Apply the equation:

$Q = c\cdot m \cdot \Delta T = \rm 0.450\times 14 \times 54 = 340.2\; J$ .

Answer from: Quest

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

time (seconds)

answer: 0 meters/second^2

Answer from: Quest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

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How much heat is absorbed by 54g iron skillet when its temperature rises from 14°c to 28°c...