Answer:
Energy is applied on the charge to do work.
Explanation:
Work is only be done when one charge moves against the electric field of anther charge that require huge amount of energy because both have same charge and the force of repulsion occurs between them. Work is defined as the product of force and displacement so from this equation we can conclude that work is done when a force is applied on an object and it moves in the direction in which force is applied. If the force or energy is removed from the charge which is present in the electric field of another charge so it moves away from that charge and the work is also be done..
Answer is A I hope it helps
Option B i.e discretion is the right and correct answer.
[C]utting programs that were not effective or essential and even some that were, but are now unaffordable; and precisely targeting our investments. Every department will feel the impact of these reductions as they cut programs or tighten their belts to free up more resources for areas critical to economic growth.
—President Barack Obama,
2012 Budget Message of the President.
The President above clearly refers to the Discretion Spending where portion of the budget is decided by Congress through the annual appropriations.
We divide the thin rectangular sheet in small parts of height b and length dr. All these sheets are parallel to b. The infinitesimal moment of inertia of one of these small parts is

where

Now we find the moment of inertia by integrating from

to

The moment of inertia is

(from (-a/2) to

(a/2))
Answer:
27.35m
Explanation:
For the calculation of the Support Force we rely on the formula for obtaining the force in a cylinder of a certain length l,

Here each term is,
= Lift force
= density of air
= vortex strength
For this last equation, its mathematical representation is given by,

Here each term is,
a= 1m, radios of cylinder
, the velocity of cylinder surface.

In order to find the density of the area at 2000m we will refer to the table of Standard Atmosphere of the United States, that is 

Replacing the values,

Clearing l and solving for it we have,

<em>In this way we can conclude that the length of the cylinder must be 27.35m</em>