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Vladimir79 [104]
3 years ago
9

What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient?

Physics
2 answers:
OLEGan [10]3 years ago
6 0
This can be seen as a trick question because heat engines can typically never be 100 percent efficient. This is due to the presence of inefficiencies such as friction and heat loss to the environment. Even the best heat engines can only go up to around 50% efficiency.
nirvana33 [79]3 years ago
6 0

Answer:

An infinite temperature

Explanation:

The efficiency of an engine is defined as:

\eta=1 -\frac{T_C}{T_H}

where

T_H is the temperature at which heat enters the engine

T_C is the temperature of the environment, to which the engine exhausts heat

From the formula, we see that for an engine to be 100% efficient, the fraction

\frac{T_C}{T_H}

must be equal to zero. Since the value of T_C is never zero (the temperature is expressed in Kelvin, and the temperature of the environment can never be exactly 0 K), the only possibility for that to occur is that the temperature at which heat enters the engine (T_H) is infinite, so that this fraction becomes zero and the efficiency becomes 1.

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Which of the following statements is true?
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Hi there!

Question - Which of the following statements is true?

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3 years ago
Newly discovered planet has twice the mass and three times the radius of the earth. What is the free-fall acceleration at its su
skad [1K]

Answer:

g_n=\dfrac{2}{9}g

Explanation:

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Dividing the two equations we get

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The acceleration due to gravity on the other planet is g_n=\dfrac{2}{9}g

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2 years ago
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Conduction and <span>convection it involves particles.</span>
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Explanation:

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At 1, the kinetic energy of the pendulum is zero (because it is not moving), and it has maximum potential energy.

At 2, the pendulum has both kinetic and potential energy, and how much of each it has depends on its height—smaller the height greater the kinetic energy and lower the potential energy.

At 3, the height is zero; therefore, the pendulum has no potential energy, and has maximum kinetic energy.

At 4, the pendulum again gains potential energy as it climbs back up,  Again how much of each forms of energy it has depends on its height.

At 5, the maximum height is reached again; therefore, the pendulum has maximum potential energy and no kinetic energy.

Hope this helps :)

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Answer:

200

Explanation:

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