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3 years ago

Did Lydia make an all-or-nothing or a marginal decision while spending her money? Justify your response.

Physics

1 answer:

defon3 years ago

5 0

Answer:

Lydia made a marginal decision because she is trying to save for her collage by spending less, she will have some money left over after paying for her necessary to go to her college tuition.

Explanation:

She saved part of it for her college tuition and spent the remainder for the prom dress, car insurance, and birthday gift.

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A cup containing 200 g of hot water is taken off the stove placed on the kitchen table. Initially the water is at 75Degree C. bu

8090 [49]

Answer:

ΔH = -45.1872 kJ , where negative sign signifies heat loss.

Q = ΔH = -45.1872 kJ , where negative sign signifies heat loss.

S system = -0.141 kJ/K

S surroundings = 0.1536 kJ/K

S universe = -0.141 kJ/K + 0.1536 kJ/K = 0.0126 kJ/K

Explanation:

Given:

Cp = 4. 184 J/(mole. K)

T₁ = 75 ⁰C

T₂ = 21 ⁰C

Mass of water = 200 g = 0.2 kg

Since,

$\Delta H=m\times C\times (T_f-T_i)$

ΔH = 0.2*4.184*(21-75) kJ

ΔH = -45.1872 kJ , where negative sign signifies heat loss.

Since the process is at constant pressure

Q = ΔH = -45.1872 kJ , where negative sign signifies heat loss.

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

T₁ = 75 ⁰C = 348 .15 K

T₂ = 21 ⁰C = 294.15 K

The entropy of the water is given by:

S = m×Cp×ln(T₂ /T₁)

S = 0.2*4.184*ln(294.15/348.15)

S system = -0.141 kJ/K

The heat gain by surroundings

dQ = -Qreaction = 45.1872 kJ

The entropy change of surroundings is

S surr = dQ/T₂ = 45.1872/294 .15

S surr = 0.1536 kJ/K

The entropy of universe is the sum total of the entropy of the system and the surroundings and thus,

S universe = Ssys + Ssurr

S universe = -0.141 kJ/K + 0.1536 kJ/K = 0.0126 kJ/K

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3 years ago

Who would be most likely to analyze a tablet with cuneiform to determine what goods were traded by the merchants of Ur?

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I think your answer would Be A. Because historians mostly study written documents, while archaeologists uncover fossils and buildings.

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3 years ago

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The force required to compress a non-standard spring as a function of displacement from equilibrium x is given by the equation f

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3 years ago

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3 years ago

Did Lydia make an all-or-nothing or a marginal decision while spending her money? Justify your response.​

Did Lydia make an all-or-nothing or a marginal decision while spending her money? Justify your response.