3 years ago

Why machines are never 100 percent efficient

2 answers:

8 0

Machines are never 100% efficient because they are made by humans and we make errors and nothing we make is perfect, that's why the machines we build are not 100% accurate or efficient.

algol133 years ago

4 0

<span>The efficiency of an actual machine is never 100% because of the Second law of thermodynamics which states that the quality of energy will decay, eventually becoming heat. This means that some of the work put into the system is transformed (lost) into thermal energy(heat) therefore, causing the percent to reduce.</span>

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What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s²?

Dominik [7]

Force is defined as Mass multiplied by Acceleration, or F = MA.
We have our mass, 15 kg.
We also have our acceleration, 8 m/s^2.
Let's plug in our numbers and solve.

F = 15(8)
Multiply 8 by 15.
8 • 15 = 120.

Your Force is 120.
Remember, the unit of measure for Force is Newtons (N).

Your final answer is:

120N.

I hope this helps!

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3 years ago

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Suppose a NASCAR race car rounds one end of the Martinsville Speedway. This end of the track is a turn with a radius of approxim

Svetach [21]

Answer:

The centripetal acceleration of the car will be 12.32 m/s² .

Explanation:

Given that

radius ,R= 57 m

Velocity , V=26.5 m/s

We know that centripetal acceleration given as follows

$a_c=\dfrac{V^2}{R}$

Now by putting the values in the above equation we get

$a_c=\dfrac{26.5^2}{57}=12.32\ m/s^2$

Therefore the centripetal acceleration of the car will be 12.32 m/s² .

7 0

4 years ago

What do you know about air?

aleksandr82 [10.1K]

Answer:

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4 years ago

A 12 volt car battery pushes a charge through the headlight circuit with a resistance of 8.5 ohms. How much current is passing t

Illusion [34]

Data:
i (current) = ? (Amps)
R (resistance) = 8.5 Ω
V (voltage) = 12 volts

Formula:
$V = R*i\to \boxed{i = \frac{V}{R} }$

Solving:
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$\boxed{\boxed{i \approx 1.41\:Amps}}\end{array}}\qquad\quad\checkmark$

8 0

3 years ago