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MARISTELLA DOS SANTOS MONTELES

MARISTELLA D.

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Viewed Questions

Convert the $[100]$ and [111] directions into the. four-index Miller-Bravais scheme for hexagonal unit cells.

Materials Science and Engineering: An Introduction

20.22. A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a large tub of ice and water. In 5 minutes of operation, the heat rejected by the engine melts 0.0400 $\mathrm{kg}$ of ice. During this time, how much work $W$ is performed by the engine?

20.22. A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a large tub of ice and water. In 5 minutes of operation, the heat rejected by the engine melts 0.0400 $\mathrm{kg}$ of ice. During this time, how much work $W$ is performed by the engine?

University Physics with Modern Physics

An ice-making machine operates in a Carnot cycle. It takes heat from water at $0.0^{\circ} \mathrm{C}$ and rejects heat to a room at $20.5^{\circ} \mathrm{C}$. Suppose that $85.0 \mathrm{~kg}$ of water at $0.0^{\circ} \mathrm{C}$ are converted to ice at $0.0^{\circ} \mathrm{C}$.
(a) How much heat is discharged into the room? 
(b) How much energy must be supplied to the device?

An ice-making machine operates in a Carnot cycle. It takes heat from water at $0.0^{\circ} \mathrm{C}$ and rejects heat to a room at $20.5^{\circ} \mathrm{C}$. Suppose that $85.0 \mathrm{~kg}$ of water at $0.0^{\circ} \mathrm{C}$ are converted to ice at $0.0^{\circ} \mathrm{C}$. (a) How much heat is discharged into the room? (b) How much energy must be supplied to the device?

University Physics with Modern Physics In SI Units

. An ice-making machine operates in a Carnot cycle. It takes
heat from water at $0.0^{\circ} \mathrm{C}$ and rejects heat to a room at $24.0^{\circ} \mathrm{C}$ .
Suppose that 85.0 $\mathrm{kg}$ of water at $0.0^{\circ} \mathrm{C}$ are converted to ice at
$0.0^{\circ} \mathrm{C}$ (a) How much heat is rejected to the room? (b) How
much energy must be supplied to the device?

. An ice-making machine operates in a Carnot cycle. It takes heat from water at $0.0^{\circ} \mathrm{C}$ and rejects heat to a room at $24.0^{\circ} \mathrm{C}$ . Suppose that 85.0 $\mathrm{kg}$ of water at $0.0^{\circ} \mathrm{C}$ are converted to ice at $0.0^{\circ} \mathrm{C}$ (a) How much heat is rejected to the room? (b) How much energy must be supplied to the device?

College Physics

Questions asked

INSTANT ANSWER

Terapia 8. Calcule \( \oint_{a} \operatorname{rot} \vec{F} \bullet d \vec{r} \), sendo \( \vec{F}(x, y, z)=(y, 0, x+y) \) e \( M \) é parametrizada por \( \chi(u, v)=\left(u, v, 2-u^{2}-v^{2}\right), \operatorname{com} u^{2}+v^{2} \leq 1 \). Resposta: \( -\pi \) Terapia 9. Calcule \( \oint_{\alpha} \operatorname{rot} \vec{F} \bullet d \vec{r} \), sendo \( \vec{F}(x, y, z)=(3 z, 4 x, 2 y) \) e \( M \) a parte do gráfico de \( z=9-x^{2}-y^{2}, z \geq 0 \) com normal exterior. Resposta: \( 36 \pi \)

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INSTANT ANSWER

Calcule Z α √ x + 1y 2 dS, em que α e a da curva 9 ´ y 3 = 4x 2 orientada de (0,0) para  1, 2 3  .

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INSTANT ANSWER

Terapia 1. Calcule \( \int_{\alpha} 2 x d x+d y+d z \), em que \( \alpha \) é a interseção do cilindro \( y=x^{2} \), do parabolóide \( z=2-x^{2}-y^{2} \) contida no octante \( x, y, z \geq 0 \). \( \mathrm{O} \) caminho deve ser percorrido de \( (1,1,0) \) a \( (0,0,2) \). Terapia 2. Calcule \( \int_{\alpha}(x y-x+y) d S \), em que \( \alpha \) é a circunferência \( x^{2}+y^{2}=1 \) orientada positivamente. Terapia 3. Calcule \( \int_{\alpha} \sqrt{x+1} y^{2} d S \), em que \( \alpha \) é a da curva \( 9 y^{3}=4 x^{2} \) orientada de \( (0,0) \) para \( \left(1, \frac{2}{3}\right) \) Terapia 4. Verifique o Teorema de Green para o campo \( \vec{F}(x, y)=\left(x y+x^{2}, x y-y^{2}\right) \) e a região limitada pelos gráficos das curvas \( y=2-x^{2} \) e \( x+y=0 \), no segundo quadrante. Terapia 5. Calcule \( \oint_{\alpha} \frac{y^{3} d x-x y^{2} d y}{\left(x^{2}+y^{2}\right)^{2}} \), em que \( \alpha \) é o polígono com vértices \( (-2,0) \), \( (0,-2),(0,2) \) e \( (3,0) \).

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INSTANT ANSWER

Terapia 2. Seja \( \vec{F}(x, y, z)=(x, y, z) \) um campo de vetores em \( \mathbb{R}^{3} \). Calcule \( \iint_{M} \vec{F} \bullet \vec{\eta} d M \) através da semi-esfera \( M \) de equação \( x^{2}+y^{2}+z^{2}=9, z \geq 0 \). Observação: usar coordenadas esféricas - resposta: \( 54 \pi \).

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ANSWERED

Bradley Duda verified

Numerade educator

Calcule div F, em que F = (x^2y, 3y^2z, 2xz).

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ANSWERED

Vincenzo Zaccaro verified

Numerade educator

Terapia 2. Calcule ( int_{alpha}(x y-x+y) d S ), em que ( alpha ) é a circunferência ( x^{2}+y^{2}=1 ) orientada positivamente.

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ANSWERED

Zack A verified

Numerade educator

5. Calcular ?? (y+2x)/(y-2x)² dxdy, onde R é a região limitada pelas curvas y - 2x = 2, y + 2x = 2, y - 2x = 1 e y + 2x = 1.

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INSTANT ANSWER

Foi realizada uma titulação de Mg2+ 0,0200 M (75,00 mL) com EDTA 0,0600 M. Calcular a concentração de todas as espécies em equilíbrio nas seguintes situações: a) no ponto de equivalência OBS: Kf’(MgEDTA) = 1010 e Kf’(CuEDTA) = 1018

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INSTANT ANSWER

Na determinação da dureza (teor de Ca2+ e Mg2+) de uma amostra de água, obtiveram-se os seguintes dados: i) Na determinação de cálcio a titulação de 50 mL da amostra, em presença de calceina e pH = 12, consumiu 3,0 mL da solução de EDTA 0,005 mol/L; ii) Na determinação de Ca + Mg a titulação de uma outra alíquota de 50 mL em presença de Negro de Eriocromo T, em pH 10, consumiu 13,5 mL da solução de EDTA 0,005 mol/L. Calcule os teores de Ca e Mg na água, expressa em mg/L.

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INSTANT ANSWER

Com 25 g de uma amostra contendo cálcio, preparou-se 250 mL de uma solução (solução 1). Transferiu-se 10 mL desta solução para um balão volumétrico de 100 mL e completou-se com água destilada (solução 2). 20 mL da solução 2 foram titulados com EDTA 0,01 mol/L, em pH 10, usando-se como indicador a calceina. Gastou-se na titulação 20 mL de EDTA. Qual o teor de Ca na amostra analisada

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