Air exits a turbine at 200 kPa and 1508C with a volumetric flow rate of 7000 liters/s. Modeling air as an ideal gas, determine t
1 answer:
Answer:
mass flow rate = 11.464 kg/sec
Explanation:
given data
P = 200 kPa = 2 × Pa
temperature = 150°C = 423 k
volumetric flow rate = 7000 liters/s
solution
first we get here molar flow rate that is express as
molar flow rate = .................1
put here value
molar flow rate =
molar flow rate = 398.06 mol/sec
and
now we get mass flow rate
mass flow rate = molar flow rate × average mol weight ..............2
mass flow rate = 398.06 × 28.8
mass flow rate = 11464.3 g/sec
mass flow rate = 11.464 kg/sec
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Answer:
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Acceleration decreases if mass of the object increases
Explanation:
The relationship between mass, acceleration and force applied on an object is described by Newton's second law:
where
F is the net force applied
m is the mass of the object
a is the acceleration
We can rewrite the equation as
So we notice that:
1) acceleration is proportional to the force: therefore, if the force applied increases, the acceleration increases as well
2) acceleration is inversely proportional to the mass: therefore, if the mass of the object increases, the acceleration will decrease
Answer: The final speed, ignoring the effects of friction, will be 2.88 m/s.
Explanation:
The problem can be solved using two different physical principles. If we resort to Newton's second Law, we can say that, neglecting friction (which is reasonable for a ice block) the only force acting on the block in the direction of the movement along the plane, is the component of the weight that is parallel to the slope, i.e.
Fp = mg sin 28.3º = ma ⇒ a=g sin 28.3º
Now, as we know that g = constant, we can use the following kinematic equation:
vf² - v₀² = 2 a x
if the block starts from rest, this means that v₀ = 0.
Replacing by the values in the equation, and solving for vf, we get;
vf = = 2.88 m/s
The other approach is using the conservation of energy principle:
When the block starts, it has some potential energy = mgh
This height h, can be expressed in terms of x (the length travelled by the block downward the plane) and the angle that forms with the horizontal, as follows:
h = x sin 28.3 (applying sin definition) ⇒ U = mg x sin 28.3
At the the end of the slide, the potential energy has been converted to kinetic energy, so we can write the following equation:
m. g. x. sin 28.3º = 1/2 m vf²
Simplifying, replacing by the values and solving for vf, we arrive to the same result as above.
Answer:
D. Frozen water is less dense than liquid water.
Explanation:
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Due to this very slight difference in density, ice floats on water. Titanic, on the night of April 14, 1912, crashed into an iceberg around midnight which caused opening of 5 of its watertight compartments. The water filled into the ship and it eventually sank in.