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2 years ago

At a constant pressure, melting occurs by A) producing energy. B) absorbing energy. C) releasing energy. D) circulating energy.

Physics

2 answers:

olganol [36]2 years ago

5 0

Realizing energy.......

Mamont248 [21]2 years ago

4 0

The correct answer to the question is B) Absorbing energy.

EXPLANATION:

As per our question, the substance is melting at constant pressure.

Melting is a process of phase change in which a solid substance is converted into liquid at its melting point. For instance, melting of ice.

The thermal energy of the liquid is more as compared to solid. Hence, the solid must have to absorb energy to be converted into liquid. The absorbed energy will be utilized in changing the solid into its corresponding liquid.

As melting is a process of phase change or state change, the temperature of the substance will be constant as long as total solid is not converted into liquid. Hence, the kinetic energy of the substance will be constant. So, the energy absorbed during melting will only change the configuration of the substance i.e the absorbed energy is converted into potential energy of the system.

Hence, the correct answer of the question is that energy is absorbed during melting.

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210 km

Explanation:

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BabaBlast [244]

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drought trends that may occur based on statistical and actual weather forecasts.
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2 years ago

1. ability to cause change * Pick One PLEASE HELP ME

kkurt [141]

Answer:

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Explanation:

8 0

3 years ago

Read 2 more answers

Photographs of many young stars show long jets of material apparently being ejected from their poles.

Rudiy27

Answer:

A) True

Explanation:

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The entire study area covers approximately 1,450 times the size of the full moon, or the equivalent of an image of 95 gigapixels. The survey reveals jets emanating from proto-stars and planetary nebulas, as well as remnants of supernovae, the illuminated edges of vast clouds of gas and dust, and the warm regions that surround massive stars and their associated groups of smaller stars.

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3 years ago

PROBLEM 5 (Problem 4-145 in 7th edition) Consider a well-insulated horizontal rigid cylinder that is divided into two compartmen

kari74 [83]

Answer:

The answer is " $\bold{83.8^{\circ} \ C}$ ".

Explanation:

Formula for calculating the mass in He:

$\to m = \frac{PV}{RT}\\$

$= \frac{500 \times 1}{ 2.0769 \times (40 + 273)}\\\\ = \frac{500 }{ 2.0769 \times 313}\\\\ = \frac{500 }{ 650.0697}\\\\= 0.76914 \ Kg$

Formula for calculating the mass in $N_2$ :

$\to m = \frac{PV}{RT}\\$

$= \frac{500 \times 1}{ 0.2968 \times (120+ 273)}\\\\ = \frac{500 }{ 0.2968 \times 393}\\\\ = \frac{500 }{ 116.6424}\\\\= 4.2866\ Kg$

by using the temperature balancing the equation:

$T' = \frac{mcT (He) + mcT ( N_2 )}{ mc (He) + mc ( N_2)}$

$= \frac{0.76914 \times 3.1156 \times 313 + 4.2866 \times 0.743 \times393}{ 0.76914 \times 3.1156 + 4.2866 \times 0.743} \\\\ = 357 \ \ K \approx 83.8^{\circ} \ C$

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2 years ago