In which situation is work being done?

a. no force is applied.

b. the force does not result in displacement.

c. the force and displacement are perpendicular to each other.

d. the force and displacement are in the same direction.

D. The force and displacement are in the same direction.

Explanation:

The Work done by a Force refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path with distance .  

Work is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy).

Now, when the applied force is constant and the direction of the force and the direction of the displacement are parallel, the equation to calculate it is:  

(1)

When they are not parallel, both directions form an angle, let's call it . In that case the expression to calculate the Work is:  

(2)

When the force and displacement are perpendicular to each other, and no work is done.

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.