If the elevator was stationary, the scale would read exactly the weight of the person:

However, the elevator is moving with an acceleration a, so the scale reads a new value of the weight, which we call W'. Newton's second law becomes

where a' is actually the total acceleration of the person, so it's the sum of the acceleraion of the elevator and of the gravitational acceleration:

Taking the direction of g (downward) as the positive direction, we can find the value of a:


So, the acceleration of the elevator is

, with same sign of g, so it's directed downward as well.
Answer:
Volume, 
Explanation:
Given that,
The diameter of a human cell is 11 μm
It is enclosed by a membrane that is 4,4 nm thick.
We need to find the volume of the cell. The cell is spherical in shape. The volume of a sphere is given by the formula as follows :

r is the radius of the sphere, r = 5.5 μm
So,

So, the volume of the cell is
.
A cactus would probably be the kind of vegitation you would find
The answer is 434J because kinetic energy is1/2Mv2