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4 years ago

Josie bought some frozen meat in a vacuum sealed package. What is one of the main reasons the manufacturer used this packaging?

Chemistry

2 answers:

frosja888 [35]4 years ago

7 0

Answer:

The sealing helps prevent oxidation from occurring.

Explanation:

APEX

Kazeer [188]4 years ago

3 0

Answer:

<u><em>The sealing helps prevent oxidation from occurring.</em></u>

Explanation:

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3 years ago

1. An electric power plant uses energy from burning coal to generate steam at 450 °C. The plant is cooled by 20 °C water

kap26 [50]

Answer:

Explanation:

Efficiency of the electric power plant is $e=1-\frac{T_{2}}{T_{1}}$

Here Temperature of hot source $T_{1} = 450^{o}C=450+273=723 K$

and Temperature of sink $T_{1} = 20^{o}C=20+273=293 K$

Hence the efficiency is $e=1-\frac{293}{723}=0.5947=59.47%$

Now another formula for thermal efficiency Is

$e_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}$

Here QI is the of heat taken from source 100 MJ ; Q2 of heat transferred to the sink (river) to be found

W is the of work done and W = QI -Q2

Hence From $e_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}$

$W=e(Q_{1})=(0.5947)(100)=59.47MJ$

Hence the of heat transferred to the river Is $Q_{2} -W = (100 -59.47=40.53$

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3 years ago

The game of kickball begins with the ball being rolled toward a player. The player then kicks the ball across the field. What is

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Answer:

C. The Speed of the ball depends on the force used to kick it.

Explanation:

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