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konstantin123 [22]

3 years ago

13

Why machines are never 100 percent efficient

2 answers:

dem82 [27]3 years ago

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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Serggg [28]

Answer:

Part a)

$t = 16.8 s$

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Part b)

$v_f = 2.86 m/s$

Explanation:

Part a)

Constant speed by which the student will run is given as

$v = 5 m/s$

now after some time if student is going to overtake the position of bus

so here the final positions will be same

so we have

$x_{bus} = x_{student}$

$0 + \frac{1}{2}at^2 + d = v_{student} t$

$\frac{1}{2}(0.170)t^2 + 60 = 5 t$

$0.085 t^2 - 5t + 60 = 0$

so it is

$t = 16.8 s$

So student will run the total distance

$d = vt$

$d = (6)(16.8)$

$d = 100.8 m$

Part b)

Speed of bus when student reach the bus is given as

$v_f = v_i + at$

$v_f = 0 + (0.170)(16.8)$

$v_f = 2.86 m/s$

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4 years ago

Every atom of the ____ carbon has 6 protons.

miss Akunina [59]

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3 years ago

Assuming 84.0% efficiency for the conversion of electrical power by the motor, what current must the 13.0-V batteries of a 716 k

tino4ka555 [31]

Answer:

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Explanation:

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Total force = 7716.8 N

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$current(I) = \dfrac{19292}{10.92}$

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AveGali [126]

Answer:

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mass m = 0.27 kg

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$U_{gravity} = U_{spring}\\ mgh = \frac{1}{2} kh^{2}$

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