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3 years ago

In a steam turbine,

Physics

1 answer:

Zanzabum3 years ago

8 0

Answer:

Efficiency = 0.273 = 27.3%

Explanation:

The ideal energy that can be produced by certain mass of diesel fuel is given as follows:

$E_{ideal} = (HV)(m)$

where,

HV = Heating Value of Diesel = 42 - 46 MJ = 44 MJ (Taking average value)

m = mass of diesel fuel = 0.3 kg

E(ideal) = Ideal energy produced by this mass of fuel = ?

Therefore,

$E_{ideal} = (44\ MJ/kg)(0.3\ kg)\\E_{ideal} = 13.2\ MJ\\$

So, the efficiency can be given as:

$Efficiency = \frac{E_{actual}}{E_{ideal}}\\\\Efficiency = \frac{3.6\ MJ}{13.2\ MJ}$

Efficiency = 0.273 = 27.3%

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If you drop a rock off a cliff and it hits the ground 3 seconds later how tall is that cliff

skelet666 [1.2K]

Answer:

Basic kinematics, negating drag and assuming ideal conditions, we use the equation:

d=vi*t+1/2*a*t^2

Since vi is 0 (we know this because you’re dropping it, not throwing it)…

…and the only acceleration acting on it is gravity, a=9.8 m/s^2…

…we get

d=1/2(9.8)(5)^2

Explanation:

Some quick mental math tells us that this is about 125 m.

Plugging it in, we find it to be 122.5 m.

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3 years ago

A very small tilt in Earth’s axis would likely cause ____.

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If the Earth's axis were closer to "straight up and down" than
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4 years ago

Read 2 more answers

Kepler's 3 laws with formula centerpital forces

madreJ [45]

Answer:

Kepler's Third Law

T = 2 π r 3 G M E . T = 2 π r 3 G M E . For an ellipse, recall that the semi-major axis is one-half the sum of the perihelion and the aphelion. For a circular orbit, the semi-major axis (a) is the same as the radius for the orbit.

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3 years ago

A grapefruit falls from a tree and hits the ground 0.72 s later.

xxTIMURxx [149]

Answer:

The grapefruit dropped 2.54 m and hit the ground at 7.06 m/s

Explanation:

Free Fall Motion

A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is $g = 9.8 m/s^2.$