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3 years ago

A machine can never be 100% efficient because some work is always lost due to which factor?

Physics

2 answers:

Pachacha [2.7K]3 years ago

8 0

Answer:

A. can never be efficient due to friction

Nataliya [291]3 years ago

5 0

HEY!!

Answer:

A. friction

Explanation:

Now if we obtain output work same as input energy then it is 100% efficient.

but this is only possible when we have no energy loss while it is not possible due to many reasons:

one of the main cause of energy loss is friction

A machine can never be 100% efficient because some work is always lost due to the lack of materials or equipment that would convert work by 100%. but so far, no machine has got 100% efficiency.

So when the machine are working there must be a friction between its working parts due to which the out-input energy is lost in different parts and hence we can never be 100% efficient machine.

HOPE IT HELPS!!

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This problem can be solved by the following equation:

$\frac{\Delta L}{L_{o}}= \alpha \Delta T$ (1)

Where:

$\Delta L$ is the change in the length of the outer skin of the Concorde

$L_{o}=62.1 m$ is the initial length of the outer skin of the Concorde

$\alpha=2.40(10)^{-5} \°C^{-1}$ is the coefficient of linear thermal expansion for aluminium

$\Delta T=T_{f}-T_{o}=200\°C - 15\°C=185\°C$ is the variation in temperature

Isolating $\Delta L$ :

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$\Delta L=(2.40(10)^{-5} \°C^{-1})(185\°C)(62.1 m)$ (3)

$\Delta L=0.275 m \frac{100 cm}{1m}=27.5 cm$ (4)

Finally:

$\Delta L=27.5 cm \approx 28 cm$

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