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3 years ago

A machine can never be 100% efficient because some work is always lost due to which factor? friction gravity static input force

Physics

2 answers:

weqwewe [10]3 years ago

6 0

Explanation:

Hi,

The answer is friction. 

There is almost no machine which are not affected by friction. It losts some work due to friction while working.

Hope it helps..

Furkat [3]3 years ago

5 0

Answer:

friction

Explanation:

the other options dont effect efficiency

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0.29 kg m² / s

Explanation:

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3 years ago

Two facing surfaces of two large parallel conducting plates separated by 8.5 cm have uniform surface charge densities such that

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Answer:

positive plate

E = 5.764 KV / m

W = 490eV or 7.85 * 10^-17 J

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Explanation:

part a

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Distance between two plates = 8.5 cm

Answer: The positive plate is at higher potential because of convention.

part b

Electric Field between the plates

E = V / d

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Answer: Electric Field between the plates E = 5.764 KV / m

part c

Work done by electric field

W = V*q

W = 490 * 1.602*10^-19

W = 7.85 * 10^-17 J

or W = 490 eV

Answer: Work done by electric field W = 490eV or 7.85 * 10^-17 J

part d

Potential Energy of an electron gained:

E_p = m_e * g * d / (1.602*10^-19)

E_p = 9.109*10^-31* 9.81 * 0.085 / (1.602*10^-19)

E_p = 4.74 *10^(-12) eV

Very very small E_p approximately 0

Answer: Potential Energy of an electron gained E_p = 4.74 *10^(-12) eV or 0.

part e

Kinetic Energy of an electron gained:

W - E_p = E_k

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E_k = 490 eV

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3 years ago

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4 years ago

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