I believe the answer is B. streak
Streak test is a method to determine what color would the mineral had if it's being transformed into a powdered form.
This test is being done by scrapping the mineral on top of white or black porcelain plate so the plate wouldn't distort the color.
Answer:
<em>At constant mass, the acceleration of an object varies (</em><em>directly</em><em>) with the net external force applied. That is to say, that an object's acceleration increases as the force applied is (</em><em>increased</em><em>), but its acceleration decreases if the force applied is (</em><em>decreased</em><em>).</em>
Explanation:
<u>Mechanical Force
</u>
According to the second Newton's law, the acceleration of an object varies directly proportional to the external net force applied and inversely proportional to the mass of the object.
If the mass is constant, then the acceleration will vary in the same way as the force does.
Completing the sentences:
At constant mass, the acceleration of an object varies (directly) with the net external force applied. That is to say, that an object's acceleration increases as the force applied is (increased), but its acceleration decreases if the force applied is (decreased).
the characteristics are to make and element
Answer:
Option 4
Explanation:
A constellation can be defined as that region formed by the stars in such a way that the formation by the group of stars in that area appear to seem an imaginary pattern of some mythological creature, animal, god or some inanimate object formed apparently.
Thus in accordance with the above definition a constellation is a group of stars that forms some apparent pattern in the celestial sphere.
Answer:
m_{flow} = 330754.35[kg/s]
Explanation:
To solve this problem we must find a more complete description, performing an internet search we find the question that should be solved:
<u>Description</u>
A hydroelectric power plant uses spinning turbines to transform the kinetic energy of moving water into electric energy with 84 % efficiency. That is, 84 % of the kinetic energy becomes electric energy. A small hydroelectric plant at the base of a dam generates 45 MW of electric power when the falling water has a speed of 18 m/s.
<u>Question</u>
<u />
What is the water flow rate −kilograms of water per second − through the turbines?Express your answer with the appropriate units.
We know that the efficiency is 84%, that is 16% of the remaining energy is lost because the mechanism of transformation from Kinetic to rotational mechanical energy, is not perfect. We must calculate the energy of the water stream taking into account this efficiency.
45 = 0.84 * Pf
Pf = 45 / 0.84
Pf = 53.57 [MW] "Kinetic energy of the water stream when impacting the turbine"
Now using the energy conservation law that tells us that the potential energy is transformed into kinetic energy, we can find the height H, with this value we can find later the volumetric flow.
![E_{k}=E_{p}\\m*g*h=0.5*m*v^2\\g*h=0.5*v^2\\9.81*h=0.5*(18)^2\\h = 16.51[m]](https://tex.z-dn.net/?f=E_%7Bk%7D%3DE_%7Bp%7D%5C%5Cm%2Ag%2Ah%3D0.5%2Am%2Av%5E2%5C%5Cg%2Ah%3D0.5%2Av%5E2%5C%5C9.81%2Ah%3D0.5%2A%2818%29%5E2%5C%5Ch%20%3D%2016.51%5Bm%5D)
The power of a turbine is calculated with the following expression:
![P_{tur}=m_{flow}*g*h\\therefore:\\m_{flow}=P_{tur}/g*h\\m_{flow}=(53.57*10^6)/(9.81*16.51)\\m_{flow}=330754.35[kg/s]](https://tex.z-dn.net/?f=P_%7Btur%7D%3Dm_%7Bflow%7D%2Ag%2Ah%5C%5Ctherefore%3A%5C%5Cm_%7Bflow%7D%3DP_%7Btur%7D%2Fg%2Ah%5C%5Cm_%7Bflow%7D%3D%2853.57%2A10%5E6%29%2F%289.81%2A16.51%29%5C%5Cm_%7Bflow%7D%3D330754.35%5Bkg%2Fs%5D)
