Homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. While, heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
Example of heterogeneous :
Oil and water
Smog
Example of homogeneous:
Salt water
Air
Answer:
Torque, 
Explanation:
Given that,
Coordinates, 
Force acting on the flea, 
Let
is the net torque about the origin on a flea. It is given by the following formula :




So, the net torque about the origin on a flea is
. Hence, this is the required solution.
Answer:static, sliding, rolling,
Explanation:
Four electrons are placed at the corner of a square
So we will first find the electrostatic potential at the center of the square
So here it is given as

here
r = distance of corner of the square from it center



now the net potential is given as


now potential energy of alpha particle at this position

Now at the mid point of one of the side
Electrostatic potential is given as

here we know that



now potential is given as


now final potential energy is given as

Now work done in this process is given as



<span>It is called a lunar eclipse</span>