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3 years ago

Disadvantages of continued polymers

Chemistry

1 answer:

saw5 [17]3 years ago

4 0

Answer:

Cannot withstand very high temperature as all plastics melt down very soon as compared to metals

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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 $Q_{2} -W = (100 -59.47=40.53$

6 0

3 years ago

A 420-N force acts on a 400-N object, and the force is from the north. In which direction will the object move?

garik1379 [7]

Answer: The object will move in the South direction.

Explanation: We are given an object of 400 N and force acting on it is 420 N from the north direction, it means the force is acting towards south.

The object will move in the direction of the net force, which is south direction.

Hence, the correct option is A.

3 0

2 years ago

Read 2 more answers

Why do we use the term formula unit for ionic compounds instead of the term molecule? Select all that apply.

VladimirAG [237]

Answer:

A and C

Explanation:

The term formula unit is use to indicate Simple-Whole Ratios of ions in a compound. KEY WORD! RATIO!

3 0

2 years ago

Definition of volume

AysviL [449]

Answer:

The amount of space an object occupies.

Explanation:

3 0

2 years ago

Atoms join together to form compounds bt gaining,loosing or sharing

user100 [1]

Answer:

the answer is C) sharing

Explanation:

positive ions & negative ions form when atom s lose or gain electrons. Covalent bonds form when atoms share electrons.Metallic bonds form by the attraction of metal ions and the electrons around them. Covalent compounds form when atoms of elements share electrons.

4 0

2 years ago

Read 2 more answers