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dlinn [17]
3 years ago
11

The efficiency of a Stirling cycle depends on the temperatures of the hot and cold isothermal parts of the cycle.If you increase

the upper temperature, keeping the lower temperature the same, does the efficiency increase,decrease, or remain the same?A. increaseB. decreaseC. remain the same
Physics
1 answer:
lesya692 [45]3 years ago
3 0

Answer:

A. increase

Explanation:

Stirling cycle having four processes

1.Two processes are constant temperature processes

2.Two processes are constant volume processes

The efficiency of Stirling cycle is same as the efficiency of Carnot cycle.

The efficiency of Stirling cycle given as

\eta=1-\dfrac{T_L}{T_H}

T_L=Lower temperature

T_H=Upper temperature

If we increase then upper temperature while the lower temperature is constant then the efficiency of Stirling cycle will increase because the ratio of lower and upper temperature will decreases.

Therefore answer is

A. increase

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If the range of a projectile's trajectory is ten times larger than the height of the trajectory, then what was the angle of laun
Lunna [17]

Answer:

Angle of projection from the horizontal will be 21.80^{\circ}

Explanation:

We have given that range of the projectile is 10 times the height of the projectile

Let the projectile is projected with velocity u at an angle \Theta

Range of the projectile is equal to R=\frac{u^2sin2\Theta }{g}

And height of the projectile is equal to h=\frac{u^2sin^2\Theta }{2g}

Now according to question range is 10 times of height

So \frac{u^2sin2\Theta }{g}=10\times \frac{u^2sin^2\Theta }{2g}

sin2\Theta =5sin^2\Theta

2sin\Theta cos\Theta =5sin^2\Theta

tan\Theta =\frac{2}{5}=0.4

\Theta =tan^{-1}0.4=21.80^{\circ}

So angle of projection from the horizontal will be 21.80^{\circ}

3 0
3 years ago
A zone reconnaissance involves a directed effort to obtain detailed information on all routes, obstacles, terrain, enemy forces,
son4ous [18]

Answer:

It is True

Explanation:.

A  commander assigns a zone reconnaissance mission when he seeks additional information on a zone before committing other forces in the zone. It is appropriate when the enemy situation is vague,  existing knowledge of the terrain is limited, or combat operations have altered the terrain. A zone  reconnaissance could include several route or area reconnaissance missions assigned to subordinate units.

7 0
3 years ago
What kind of thermal transfer 1.conduction 2.convective 3.radiation from the sun?
Lana71 [14]
Answer:
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Explanation:
Radiation is the type of heat transfer through the electromagnetic waves. Transfer of heat by radiation can occur in space/vacuum as in between the sun and the earth

On the other hand:
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Hope this helps :)
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Some elements that have a symbol entirely different from the spelling are..

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3 years ago
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the answer is 1 because a single pulley has 1 rope


5 0
3 years ago
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