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3 years ago

Steam enters a turbine at 400K and exhausts at 360K. Calculate the maximum efficiency. =%

Physics

1 answer:

kozerog [31]3 years ago

8 0

The maximum efficiency is 10%

Explanation:

The maximum efficiency of a machine is given by:

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

where

$T_H$ is the temperature of the hot reservoir

$T_C$ is the temperature of the cold reservoir

For the machine in this problem, we have:

$T_H=400K$ is the temperature of the hot reservoir

$T_C=360K$ is the temperature of the cold reservoir

substituting, we find the max efficiency:

$\eta=1-\frac{360}{400}=0.1$

So, the efficiency is 0.10 (10%).

Learn more about temperature:

brainly.com/question/1603430

brainly.com/question/4370740

#LearnwithBrainly

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Answer:

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Explanation:

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3 years ago

A uniform solid disk with a mass of 24.3 kg and a radius of 0.364 m is free to rotate about a frictionless axle. Forces of 90.0

a_sh-v [17]

Answer:

a. $-12.7 Nm$

b. $-7.9 rad/s^2$

Explanation:

I have attached an illustration of a solid disk with the respective forces applied, as stated in this question.

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Other parameters given include:

Mass of solid disk, $M = 24.3kg$

and radius of solid disk, $r = 0.364m$

a.) The formula for determining torque ( $T$ ), is $T = r * F$

Hence the net torque produced by the two forces is given as a summation of both forces:

$T = T_{125} + T_{90}\\= -r(125)sin90 + r(90)sin90\\= 0.364(-125 + 90)\\= -12.7 Nm$

b.) The angular acceleration of the disk can be found thus:

using the formula for the Moment of Inertia of a solid disk;

$I_{disk} = {\frac{1}{2}}Mr^2$

where $M$ = Mass of solid disk

and $r$ = radius of solid disk

We then relate the torque and angular acceleration ( $\alpha$ ) with the formula:

$T = I\alpha \\-12.7 = ({\frac{1}{2}}Mr^2)\alpha \\\alpha = -{\frac{12.7}{1.61}} = -7.9 rad/s^2$

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3 years ago

The first law of thermodynamics states that energy can neither be created nor destroyed. If this is true then why are we always

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Answer:

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Explanation:

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2 years ago

One major difference between plant and animal cells is that plant cells are the only ones with ?

sineoko [7]

Plant cells have a cell wall.

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3 years ago

Read 2 more answers

A bathtub contains 65 gallons of water and the total weight of the tub and water is approximately 931.925 pounds. You pull the p

levacccp [35]

Answer:

$Q = 8,345 * v$

Explanation:

So, we are looking for an expression of the amount of water that has been drained from the tub. The expression is in terms of v that represent the number of gallons of water drained since the plug was pulled. Since we are interested in the pounds of water that has been drained from the tub we need to take into account that for every gallon of water drained, 8.345 pounds have left the tub. Therefore, the expression for the weight of water Q that has been drained from the tub in terms of v is simply :

$Q = 8,345 * v$

Where v is the amount of gallons that has been drained from the tub.

Have a nice day. let me know if I can help with anything else

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3 years ago