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3 years ago

Based on the second law of thermodynamics why must a machine always be less than 100% efficient?

Physics

2 answers:

goldenfox [79]3 years ago

5 0

Heat is never converted completely into mechanical energy APEX

Zigmanuir [339]3 years ago

3 0

heat never moves from cold to hot

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Consider two transformers. Transformer A has 300 turns on its primary and 500 turns on its secondary. Transformer B has 250 turn

rusak2 [61]

Answer:

Secondary voltage on second transformer is 200 volt.

Explanation:

It is given two transformer

Let us consider first transformer.

Number of turns in primary $N_p=300$

Numb er of turns in secondary $N_s=500$

Now consider second transformer

Number of turns in primary $N_p=250$

Number of turns in secondary $N_s=1000$

Now it is given that same voltage of 50 volt is applied to primary of both the transformer.

For second transformer

$\frac{N_p}{N_s}=\frac{V_p}{V_s}$

$\frac{250}{1000}=\frac{50}{V_s}$

$V_s=200volt$

So secondary voltage on second transformer is 200 volt

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4 years ago

Tell the different energy transformations that happen in each of these items

Alik [6]

Answer:

Television: Electricity to light Toaster: Electricity to Heat

Explanation:

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3 years ago

Briefly explain how a resonance tube works

Lera25 [3.4K]

Answer:

As the tines of the tuning fork vibrate at their own natural frequency, they created sound waves that impinge upon the opening of the resonance tube. These impinging sound waves produced by the tuning fork force air inside of the resonance tube to vibrate at the same frequency.

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2 years ago

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Assuming the earth is a uniform sphere of mass M and radius R, show that the acceleration of fall at the earth's surface is give

Keith_Richards [23]

Explanation:

The weight of an object on the surface of the earth is equal to the gravitational force exerted by the earth on the object.

$W=F_G$