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IgorLugansk [536]
3 years ago
10

The diagram below represents an electromagnetic wave. Please Help​

Physics
1 answer:
forsale [732]3 years ago
8 0

Answer:

I'm pretty sure it's A

Explanation:

bc the crest is is the point on the wave

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Although these quantities vary from one type of cell to another, a cell can be 1.9 μm in diameter with a cell wall 60 nm thick.
DaniilM [7]

Answer: 2(10)^{-9} mg

Explanation:

We know the total diameter of the cell (assumed spherical) is:

d=1.9\mu m=1.9(10)^{-6} m

Then its total radius r=\frac{d}{2}=\frac{1.9(10)^{-6} m}{2}=9.5(10)^{-7} m

On the other hand, we know the thickness of the cell wall is r_{t}=60 nm= 60(10)^{-9} m and its density is the same as water (\rho=997 kg/m^{3}).

Since density is the relation between the mass m and the volume V:

\rho=\frac{m}{V}

The mass is: m=\rho V (1)

Now if we are talking about this cell as a thin spherical shell, its volume will be:

V=\frac{4}{3}\pi R^{3} (2)

Where  R=r-r_{w}=9.5(10)^{-7} m - 60(10)^{-9} m

Then:

V=\frac{4}{3}\pi (9.5(10)^{-7} m - 60(10)^{-9} m)^{3} (3)

V=2.952(10)^{-18} m^{3} (4)

Substituting (4) in (1):

m=(997 kg/m^{3})(2.952(10)^{-18} m^{3}) (5)

m=2.94(10)^{-15} kg (6)

Knowing 1 kg=1000 g and 1 mg=0.001 g:

m=2.94(10)^{-15} kg=2(10)^{-9} mg

7 0
3 years ago
Si se tiene un gato hidráulico y se aplica una fuerza en el Area 1, se refleja otra fuerza en el Area 2, teniendo en cuenta la s
iren [92.7K]

Answer:

the forces are proportional to their areas of application

Explanation:

In a hydraulic jack, Pascal's principle is used, that the pressure in an incompressible liquid is the same at the same height, whereby the pressure on both sides of the jack are the same

           P₁ = P₂

the pressure is defined by

            P = F / A

we substitute

           \frac{F_1}{A_1}  = \frac{F_2}{A_2}

           F₂ = \frac{A_2}{A_1} \ F_1

therefore the force is F₂> F₁

Therefore the forces are proportional to their areas of application

7 0
3 years ago
What voltage produces a 6-A current in a circuit thhat has a total resistance of 3 Ω ?
-Dominant- [34]
The equation we need to use is Ohm's Law

Voltage = Current * Resistance

Voltage = 6A * 3<span>Ω = 18 Volts</span>
7 0
3 years ago
a small object is placed between two plane mirrors inclined at an angle of 60° to each other in a dark room how many images are
OLga [1]

Answer:

nothing

Explanation:

bocouse of darkness

5 0
3 years ago
If the forces acting upon an object are balanced, then an object MUST
yulyashka [42]

Stationary at rest or moving with constant motion

Explanation:

If the force acting upon an object are balanced, the object must be stationary or at rest or moving with constant velocity.

According to newton's first law of motion;

"An object will remain in its state of rest or of uniform motion unless acted upon by an external force".

This suggests that body at rest has balanced forces acting upon it.

learn more:

Newton's laws brainly.com/question/11411375

#learnwithBrainly

7 0
3 years ago
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