Time stops everything is made out of atoms so if atoms freeze everything freezes
Answer:
A change in size, shape, or matter.
Explanation:
A physical change does not produce new substances. A physical change may only change the physical properties of a substance. a change in size, shape, or phase of matter.
The centripetal acceleration is 
Explanation:
For an object in uniform circular motion, the centripetal acceleration is given by

where
v is the speed of the object
r is the radius of the circle
The speed of the object is equal to the ratio between the length of the circumference (
) and the period of revolution (T), so it can be rewritten as

Therefore we can rewrite the acceleration as

For the particle in this problem,
r = 2.06 cm = 0.0206 m
While it makes 4 revolutions each second, so the period is

Substituting into the equation, we find the acceleration:

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Answer: (a) Smaller charge is
and larger charge is
.
(b) Smaller charge is
and larger charge is
.
Explanation:
(a) When both the spheres have same charge then force is repulsive in nature as like charges tend to repel each other.
Therefore, total charge on the two non-conducting spheres will be calculated as follows.

= 
Therefore, force between the two spheres will be calculated as follows.
F = 
12 N = 

or, 



This means that smaller charge is
and larger charge is
.
(b) When force is attractive in nature then it means both the charges are of opposite sign.
Hence, total charge on the non-conducting sphere is as follows.


Now, force between the two spheres is calculated as follows.
F = 
12 N = 



Hence, smaller charge is
and larger charge is
.