just analyze it in this way:
20cos30*=10( radical 3 )
20sin30*=10
Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Answer: a switch can do A, B and E
Explanation:
Answer:

Explanation:
= Permittivity of free space = 
A = Area
h = Altitude = 600 m
Electric flux through the top would be
(negative as the electric field is going into the volume)
At the bottom

Total flux through the volume

Electric flux is given by

Charge per volume is given by

The volume charge density is 