Answer:
it takes 365 days to revolve around the star(sun)
Answer:
Maximum distance of image from mirror is equal to focal length of the mirror
Explanation:
As we know by the equation of mirror we have
![\frac{1}{d_i} + \frac{1}{d_o} = \frac{1}{f}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bd_i%7D%20%2B%20%5Cfrac%7B1%7D%7Bd_o%7D%20%3D%20%5Cfrac%7B1%7D%7Bf%7D)
here we know for convex mirror
object position is always negative as it will be placed behind the mirror always
while the focal length of the convex mirror is always taken positive
So here we have
![\frac{1}{d_i} + \frac{1}{-d_o} = \frac{1}{f}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bd_i%7D%20%2B%20%5Cfrac%7B1%7D%7B-d_o%7D%20%3D%20%5Cfrac%7B1%7D%7Bf%7D)
![\frac{1}{d_i} = \frac{1}{d_o} + \frac{1}{f}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bd_i%7D%20%3D%20%5Cfrac%7B1%7D%7Bd_o%7D%20%2B%20%5Cfrac%7B1%7D%7Bf%7D)
so here maximum value of image distance is equal to focal length of the mirror
Answer:
R / 64
Explanation:
Let he length of the wire is L and its resistance is R.
The resistance of the wire is directly proportional to the length of the wire. As the wire is cut into 8 equal pieces so the resistance of small wire is R/8.
Now they are connected in parallel.
The equivalent resistance is given by
![\frac{1}{R_{eq}}= 8\times \frac{8}{R}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7BR_%7Beq%7D%7D%3D%20%208%5Ctimes%20%5Cfrac%7B8%7D%7BR%7D)
![R_{eq}=\frac{R}{64}](https://tex.z-dn.net/?f=R_%7Beq%7D%3D%5Cfrac%7BR%7D%7B64%7D)
Thus, the equivalent resistance of the new cable is R / 64.