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Ilia_Sergeevich [38]
3 years ago
12

Plzz help its science

Chemistry
1 answer:
Aleks04 [339]3 years ago
7 0

The efficiency : 95%

<h3>Further explanation</h3>

Efficiency : the ratio between output and input work

In general, the value of the output of a machine is less than the value of the input because of the frictional force in the machine.

The greater the efficiency of the engine, the better the machine

Can be formulated :

\tt E=\dfrac{W_{out}}{W_{in}}\times 100\%

w output = 190 J

W input = 200 J

The efficiency :

\tt E=\dfrac{190}{200}\times 100\%=95\%

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What statement best describes solution
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Solution is a mixture of solvent and solute. Which dissove completely.

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                     Solution - Salt solution

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4 years ago
Which of the following is(are) the reason(s) metals are good conductors of heat and electricity? Select all that apply
Mariana [72]

Answer: The question is incomplete and the options are not given but here are the options.

a. Metals can absorb more heat flow than other elements before damage occurs.

b. Particles of metallic structure begin to vibrate faster as they absorb energy.

c. Metals have a larger number of freely moving electrons.

d.Metals have high densities.

e. Metals have high melting points.

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c. Metals have a larger number of freely moving electrons.

d.Metals have high densities.

e. Metals have high melting points.

The correct options are c,d and e.

Explanation:

Metals are real good conductor of heat because of the following;

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Metals have high densities which is because their crystal lattice are packed very tight in the metallic structure making the metal bond to be stronger and conduct heat.

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