Gravity is an example of friction. If we didn't have gravity, we would be flying all over the place. Also, friction keeps us from sliding on the ground and falling.
Answer:
Part a)
First image
![d_i = 7.06 cm](https://tex.z-dn.net/?f=d_i%20%3D%207.06%20cm)
second image
![d_i = 13.3 cm](https://tex.z-dn.net/?f=d_i%20%3D%2013.3%20cm)
Part b)
First image
![h_i = 0.1765 cm](https://tex.z-dn.net/?f=h_i%20%3D%200.1765%20cm)
Second image
![h_i = 0.11 cm](https://tex.z-dn.net/?f=h_i%20%3D%200.11%20cm)
Explanation:
When object is placed between mirror and convex mirror
then for the first image
![d_o = 10 cm](https://tex.z-dn.net/?f=d_o%20%3D%2010%20cm)
![f = 24 cm](https://tex.z-dn.net/?f=f%20%3D%2024%20cm)
now from the mirror formula
![\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 have
![\frac{1}{d_i} + \frac{1}{-10} = \frac{1}{24}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bd_i%7D%20%2B%20%5Cfrac%7B1%7D%7B-10%7D%20%3D%20%5Cfrac%7B1%7D%7B24%7D)
![d_i = 7.06 cm](https://tex.z-dn.net/?f=d_i%20%3D%207.06%20cm)
For second position of image we will take object for convex mirror to be the position of image formed in plane mirror
so the distance of that image from convex mirror is
![d_o = 30 cm](https://tex.z-dn.net/?f=d_o%20%3D%2030%20cm)
now by mirror formula
![\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)
![\frac{1}{d_i} + \frac{1}{-30} = \frac{1}{24}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bd_i%7D%20%2B%20%5Cfrac%7B1%7D%7B-30%7D%20%3D%20%5Cfrac%7B1%7D%7B24%7D)
![d_i = 13.3 cm](https://tex.z-dn.net/?f=d_i%20%3D%2013.3%20cm)
Part b)
Height of image and height of object is related by the equation
![h_i = \frac{d_i}{d_o} h_o](https://tex.z-dn.net/?f=h_i%20%3D%20%5Cfrac%7Bd_i%7D%7Bd_o%7D%20h_o)
![h_i = \frac{7.06}{10}(0.250)](https://tex.z-dn.net/?f=h_i%20%3D%20%5Cfrac%7B7.06%7D%7B10%7D%280.250%29)
![h_i = 0.1765 cm](https://tex.z-dn.net/?f=h_i%20%3D%200.1765%20cm)
for height of second image
![h_i = \frac{13.3}{30}(0.250)](https://tex.z-dn.net/?f=h_i%20%3D%20%5Cfrac%7B13.3%7D%7B30%7D%280.250%29)
![h_i = 0.11 cm](https://tex.z-dn.net/?f=h_i%20%3D%200.11%20cm)
I would say 3 is the answer
An object with volume greater than it mass. to account less density and thus it will float
Quantity representing the amount of water vapor in the atmosphere or a gas.
Ex. Precipitation and temperature are things that increase it