It is called polarizability. A dipole moment is needed for the molecule or atom due to the distortion of the electron cloud. A dipole is a pair of electrical charges that have opposite signs and during a dipole moment two charges separate.
Answer: Option A
Explanation:
The potential energy decreases in the case when the charges are opposite and they attract each other.
In this case there is no external energy required in order to put the charges together.
This is so because the charges are opposite and they will attract each other. Yes, the only condition should be that the charges should be alike.
Example: a negative charge and a positive charge.

Actually Welcome to the Concept of the Kinematics.
1.) Distance travelled = 15+20 = 35 miles.
Ai the total distance covered is 35 miles.
2.) Displacement is the shortest distance from the initial point to the final point.
here it's ==> 20-15 = 5 miles
hence, displacement = 5 miles
Answer:

Explanation:
Previous concepts
The Thermal radiation is one of "3 mechanisms who allows to bodies exchange energy".
The thermal radiation formula is given by:

Where 
If we solve for P we got:

Since we have a baseball ball considered as a sphere the superficial area is given by:

Solution to the problem
And if we replace this into our equation of P we got:

And we can reorder this like that:

We can convert the radius to meters and we got:

Now we can convert the temperature to Kelvin and we got:

the emissivity given
And now we can replace into the formula for P and we got:

