the answer is C
IGNORW irritating but not even on the golden bath bath and
The answer is B I hope this helps luv
The work-energy theorem explains the idea that the net work - the total work done by all the forces combined - done on an object is equal to the change in the kinetic energy of the object. After the net force is removed (no more work is being done) the object's total energy is altered as a result of the work that was done.
This idea is expressed in the following equation:
is the total work done
is the change in kinetic energy
is the final kinetic energy
is the initial kinetic energy
mark me as brainliest ❤️
The chemical symbol for the element zinc is Zn.
<h3>What is element?</h3>
A chemical element is the one which reacts with other elements to form a compound.
Any chemical symbol must have its first letter written in Uppercase. If the element has two letter chemical symbol, then it should be written in lowercase.
Thus, the student wrote Zn as the chemical symbol of Zinc on the whiteboard.
Learn more about element.
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Explanation:
The coordinates of points are:
A (0, 70, 0),
B (40, 0, 0), C (40, 0, 40) D (60, 0, 60).
The position vectors for corresponding cables are:
the unit vectors for these positions are:
![u_{AD} =r_{AD} /[r_{AD} ]=(-60/110)i-(70/110)j-(60/110)k\\=-0.5455i-0.6364j-0.5455k](https://tex.z-dn.net/?f=u_%7BAD%7D%20%3Dr_%7BAD%7D%20%2F%5Br_%7BAD%7D%20%5D%3D%28-60%2F110%29i-%2870%2F110%29j-%2860%2F110%29k%5C%5C%3D-0.5455i-0.6364j-0.5455k)
![u_{AC} =r_{AC} /[r_{AC} ]=-(40/90)i-(70/90)j+(40/90)k\\=-0.444i-0.778j+0.444k](https://tex.z-dn.net/?f=u_%7BAC%7D%20%3Dr_%7BAC%7D%20%2F%5Br_%7BAC%7D%20%5D%3D-%2840%2F90%29i-%2870%2F90%29j%2B%2840%2F90%29k%5C%5C%3D-0.444i-0.778j%2B0.444k)
![u_{AB} =r_{AB}/[ r_{AB} ]=(40/80.6)j-(70/80.6)j+0k\\=0.4963i-0.8685j+0k](https://tex.z-dn.net/?f=u_%7BAB%7D%20%3Dr_%7BAB%7D%2F%5B%20r_%7BAB%7D%20%5D%3D%2840%2F80.6%29j-%2870%2F80.6%29j%2B0k%5C%5C%3D0.4963i-0.8685j%2B0k)
The factors are:
![F_{AB} =[F_{AB} ]u_{AB} =0.9926i-1.737j+0k\\\\F_{AC}= [F_{AC]} u_{AC} =-0.8888i-1.5556j+0.8888k](https://tex.z-dn.net/?f=F_%7BAB%7D%20%3D%5BF_%7BAB%7D%20%5Du_%7BAB%7D%20%3D0.9926i-1.737j%2B0k%5C%5C%5C%5CF_%7BAC%7D%3D%20%5BF_%7BAC%5D%7D%20u_%7BAC%7D%20%3D-0.8888i-1.5556j%2B0.8888k)
![F_{AD} =[F_{AD}] u_{AD} =-1.0910i-1.2728j-1.0910k](https://tex.z-dn.net/?f=F_%7BAD%7D%20%3D%5BF_%7BAD%7D%5D%20u_%7BAD%7D%20%3D-1.0910i-1.2728j-1.0910k)
so The resultant force exerted on tower by cables are:
![F_{R} =F_{AB}+ F_{AC}+ F_{AD} \\=-0.9875i-4.5648j-0.2020k\\magnitude=[F_{R} ]=4.674kN](https://tex.z-dn.net/?f=F_%7BR%7D%20%3DF_%7BAB%7D%2B%20F_%7BAC%7D%2B%20F_%7BAD%7D%20%5C%5C%3D-0.9875i-4.5648j-0.2020k%5C%5Cmagnitude%3D%5BF_%7BR%7D%20%5D%3D4.674kN)
