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algol [13]
3 years ago
13

Is it possible to decrease resistance of the wire without changing the material it's made out of?

Chemistry
1 answer:
loris [4]3 years ago
3 0
Yes, it is possible to decrease the resistance of a wire without changing the material it made out of. This is because, there are many factors which affect the resistance of a wire. These factors can be manipulated to change the resistance of the wire. The factors include: cross sectional area of the wire, length of the wire, temperature and the material of the wire. The other three factors can be manipulated to change the resistance of the wire without changing the material of the wire.
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What energy transformation occur when wood is burned
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C. Chemical energy transforms into thermal energy and light energy.

The reason why this is the answer is because thermal energy and heat energy are basically the same things, so D is wrong. Another reason why is because the wood wasn't on fire to begin with so it cant be A. The final reason is that wood cannot create electricity. 
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Balance the equations
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Determine the minimum work required by an air compressor. At the inlet the conditions are 150 kg/min, 125 kPa and 33 °C. At the
Firdavs [7]

Explanation:

The given data is as follows.

               MW = 29 g/mol,         C_{p} = 3.5 R

Formula to calculate minimum amount of work is as follows.

            W_{s} = C_{p}T_{1}[(\frac{P_{2}}{P_{1}})^{\frac{R}{C_{p}}} - 1]

                          = 3.5 \times 8.314 J/k mol \times 306 \times [(\frac{550}{125})^{\frac{1}{3.5}} - 1]

                          = 4.692 kJ/mol

Therefore, total work done will be calculated as follows.

                        Total work done = m \times W_{s}

Since, m = \frac{150 \times 10^{3}g/min}{29}. Therefore, putting these values into the above formula as follows.

            Total work done = m \times W_{s}

                                        = \frac{150 \times 10^{3}g/min}{29} \times 4.692 kJ/min      

                                       = 24268.96 kJ/min

It is known that 1 kJ/min = 0.0166 kW. Hence, convert 24268.96 kJ/min into kW as follows.

                   24268.96 kJ/min \times \frac{0.0166 kW}{1 kJ/min}                                                    

                   = 402.86 kW

Thus, we can conclude that the minimum work required by an air compressor is 402.86 kW.

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