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Sholpan [36]
3 years ago
5

What is efficiency of a machine?

Physics
2 answers:
Nataly_w [17]3 years ago
7 0

Answer:

<em>Efficiency</em><em> </em><em>of</em><em> </em><em>a</em><em> </em><em>machine </em><em>is</em><em> </em><em>defined </em><em>as</em><em> </em><em>the</em><em> </em><em>ratio</em><em> </em><em>of</em><em> </em><em>output </em><em>work</em><em> </em><em>to</em><em> </em><em>input </em><em>work </em><em>in</em><em> </em><em>a</em><em> </em><em>machine </em><em>.</em><em> </em><em>It</em><em> </em><em>is</em><em> </em><em>expressed</em><em> </em><em>in</em><em> </em><em>percentage </em><em>and</em><em> </em><em>denote</em><em>d</em><em> </em><em>by</em><em> </em>

<em>η</em><em> </em><em>(</em><em> </em><em>eta</em><em>)</em><em>.</em>

Flura [38]3 years ago
6 0
Mechanical efficiency is a measure of how well the machine converts the input work or energy into some useful output. It is calculated by dividing the output work by the input work. The ideal machine has mechanical efficiency equal to unity, while the real machine has mechanical efficiency less than unity
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Is an atom with one valence electron more reactive than an atom with two electrone? ​
andrey2020 [161]

Answer:

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Read 2 more answers
I. What is the initial velocity of the car?
qaws [65]

Answer:

I. 0 m/s

II. 20 m/s

III. Part BC

Explanation:

I. Determination of the initial velocity.

From the diagram given above,

The motion of the car starts from the origin. This implies that the car start from rest and as such, the initial velocity of the car is 0 m/s

II. Determination of the maximum velocity attained.

From the diagram given above, we can see clearly that the maximum velocity is 20 m/s.

III. Determination of the part of the graph that represents zero acceleration.

It important that we know the meaning of zero acceleration.

Zero acceleration simply means the car is not accelerating. This can only be true when the car is moving with a constant velocity.

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6 0
3 years ago
a cell phone uses 3.0V battery. the circuit board needs a 0.05 A current. what size resistor is needed to generate this current
san4es73 [151]

Answer:

60 Ohms

Explanation:

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V=IR

Where V is the voltage, I is current and R is resistance

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R=\frac {V}{I}

Substituting 3.0V for V and 0.05 A for I then

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What is the period of a sound wave having a frequency of 340hz?
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