2 years ago

An environmental scientist performs research to discover what is in the solid

Physics

2 answers:

xxMikexx [17]2 years ago

8 0

Answer:

D i took the test

Explanation:

Sholpan [36]2 years ago

8 0

Answer:

The answer is D.

Explanation:

The other ones just don't make sense. AT ALLLLLL!!!!!!!!!!!!!!!!!!!!!!!

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kakasveta [241]

Answer:

$W=4037.36\ J$

Explanation:

Given:

mass of ice melted, $m=3.3\times10^{-2}\ kg$

time taken by the ice to melt, $t=5\ min=300\ s$

latent heat of the ice, $L=3.34\times 10^5\ J$

Now the heat rejected by the Carnot engine:

$Q_R=m.L$

$Q_R=0.033\times 3.34\times 10^5$

$Q_R=11022\ J$

Since we have boiling water as hot reservoir so:

$T_H=373\ K$

The cold reservoir is ice, so:

$T_L=273\ K$

Now the efficiency:

$\eta=1-\frac{T_L}{T_H}$

$\eta=1-\frac{273}{373}$

$\eta=26.81\%$

Now form the law of energy conservation:

Heat supplied:

$Q_S-W=Q_R$

where:

$Q_S=$ heat supplied to the engine

$Q_S-\eta\times Q_S=Q_R$

$Q_S(1-\eta)=Q_R$

$Q_S=\frac{11022}{1-0.2681}$

$Q_S=15059.36\ J$

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$W=Q_S-Q_R$

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$W=4037.36\ J$

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2 years ago

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We Know, F = m.a
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Substitute for it,
F = 2*2 Kgm/s²
F = 4 Kgm/s²

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3 years ago