Explanation:
(a) Formula to calculate the density is as follows.

= 
= 
Now, calculate the charge as follows.

= 
=
C
or, = 101.06 nC
(b) For r = 6.50 cm, the value of charge will be calculated as follows.

= 
= 7.454 
Answer:
the pull or push which changes or tends to change the position of an object from rest to motion or motion to rest is called force.
Changes of force that can be produced:
- Force can change the shape of a body.
- Force can change the position of a body.
- Force can stop the moving body.
- Force can change the speed of a moving body.
- Force can change the direction of a moving body.
Answer:
d) The molecules in A have more average kinetic energy per molecule than those in B
e) The molecules in A are moving faster than those in B
Explanation:
Given that
Size of boxes are equal
So volume of boxes = V
Temperature in box A =50°C = 323 k
Temperature in box B = 10°C = 283 K
We know that for ideal gas
P V = m R T
The mass of gases is not given so we can not say that which have high temperature.Also be can not say that which box have more molecule.
We know that average kinetic energy is directly proportional to the absolute temperature of gas that is why we can say that box A will have more kinetic energy because it have high temperature.We know that is gas have high kinetic energy then we can say that it have high moving velocity.
So the option d and e is correct.
d) The molecules in A have more average kinetic energy per molecule than those in B
e) The molecules in A are moving faster than those in B