2 answers:
Answer:
1) B
2) B
Explanation:
1) because the relative atomic mass of zinc is 29 and it has a valence electron of 2+ charge.
2) Oxygen because it is has the second highest electronegativity and has a valence electron of-2 charge.
Answer:
1.b,2.b
Explanation:
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Answer: Always accelerates in a downward direction
Explanation: Gravity is pulling the ball downward
Answer:
9 cm
-36 cm
Explanation:
u = Object distance
v = Image distance
f = Focal length = 12
m = Magnification = 4
![m=-\frac{v}{u}\\\Rightarrow 4=-\frac{v}{u}\\\Rightarrow v=-4u](https://tex.z-dn.net/?f=m%3D-%5Cfrac%7Bv%7D%7Bu%7D%5C%5C%5CRightarrow%204%3D-%5Cfrac%7Bv%7D%7Bu%7D%5C%5C%5CRightarrow%20v%3D-4u)
Lens equation
![\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow \frac{1}{12}=\frac{1}{u}+\frac{1}{-4u}\\\Rightarrow \frac{1}{12}=\frac{3}{4u}\\\Rightarrow u=9\ cm](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bf%7D%3D%5Cfrac%7B1%7D%7Bu%7D%2B%5Cfrac%7B1%7D%7Bv%7D%5C%5C%5CRightarrow%20%5Cfrac%7B1%7D%7B12%7D%3D%5Cfrac%7B1%7D%7Bu%7D%2B%5Cfrac%7B1%7D%7B-4u%7D%5C%5C%5CRightarrow%20%5Cfrac%7B1%7D%7B12%7D%3D%5Cfrac%7B3%7D%7B4u%7D%5C%5C%5CRightarrow%20u%3D9%5C%20cm)
Object distance is 9 cm
![v=-4\times 9=-36\ cm](https://tex.z-dn.net/?f=v%3D-4%5Ctimes%209%3D-36%5C%20cm)
Image distance is -36 cm (other side of object)
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hope it helps.</span>
we can find the total displacement by having the sum of distance from the beginning to the ending.
Answer:
The "Insulators have high resistance, while conducters have low resistance".