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xz_007 [3.2K]
3 years ago
5

¿ que es una onda mecánica y como es su gráfica? ¿qué es la amplitud y la frecuencia ?

Physics
1 answer:
Ainat [17]3 years ago
8 0

Una onda mecánica es una onda que no es capaz de transmitir su energía a través del vacío. Las ondas mecánicas requieren un medio para transportar su energía de un lugar a otro. Una onda de sonido es un ejemplo de onda mecánica. Las ondas sonoras son incapaces de viajar a través del vacío. ¡su gráfico está debajo! La amplitud es un parámetro importante de las ondas y es el desplazamiento máximo de puntos en una onda. Dicho de otra manera, la amplitud es la distancia vertical entre un pico o un valle y el punto de equilibrio. La frecuencia es el número de ciclos de ondas que pasan por un punto por unidad de tiempo.

¡Espero que esto te ayude! Buena suerte y que tengas un gran día. :)

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A: The acceleration is 7.7 m/s up the inclined plane.

B: It will take the block 0.36 seconds to move 0.5 meters up along the inclined plane

Explanation:

Let us work with variables and set

m=5kg\\\\F_H=100N\\\\\mu=0.3\\\\\theta=37^o.

As shown in the attached free body diagram, we choose our coordinates such that the x-axis is parallel to the inclined plane and the y-axis is perpendicular. We do this because it greatly simplifies our calculations.

Part A:

From the free body diagram we see that the total force along the x-axis is:

F_{tot}=mg*sin(\theta)+F_s-F_Hcos(\theta).

Now the force of friction is F_s=\mu*N, where N is the normal force and from the diagram it is F_y=mg*cos(\theta).

Thus F_s=\mu*N=\mu*mg*cos(\theta).

Therefore,

F_{tot}=mg*sin(\theta)+\mu*mg*cos(\theta)-F_Hcos(\theta)\\\\=mg(sin(\theta)+\mu*cos(\theta))-F_Hcos(\theta).

Substituting the value for F_H,m,\mu, and \:\theta we get:

F_{tot}= -38.63N.

Now acceleration is simply

a=\frac{F_H}{m} =\frac{-38.63N}{5kg} =-7.7m/s.

The negative sign indicates that the acceleration is directed up the incline.

Part B:

d=\frac{1}{2} at^2

Which can be rearranged to solve for t:

t=\sqrt{\frac{2d}{a} }

Substitute the value of d=0.50m and a=7.7m/s and we get:

t=0.36s.

which is our answer.

Notice that in using the formula to calculate time we used the positive value of a, because for this formula absolute value is needed.

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