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DerKrebs [107]
3 years ago
9

Resueltas:

Physics
1 answer:
BabaBlast [244]3 years ago
7 0

Answer:

<em>El automovilista recorrió 92.315 metros</em>

Explanation:

<u>Movimiento Uniformemente Acelerado</u>

Ocurre cuando la rapidez de un móvil cambia en cantidades iguales en tiempos iguales. El cambio de velocidad por unidad de tiempo es llamado aceleración.

Siendo vo la rapidez inicial del móvil, vf su velocidad final, y t el tiempo que tarda en variar la velocidad, la aceleración se calcula con la fórmula:

\displaystyle a=\frac{v_f-v_o}{t}\qquad\qquad [1]

Por su parte, el móvil en su trayectoria recorre una distancia x dada por:

\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2]

Datos: El automovilista lleva inicialmente una rapidez vo=30.5 m/s y la disminuye uniformemente con una aceleración (de frenado) de a=-3\ m/s^2 hasta reducir a vf=19.4 m/s.

Despejando el tiempo de la ecuación [1] y substituyéndolo en la [2], obtenemos la relación:

V_f^2=V_o^2+2ax

De donde podemos calcular x:

\displaystyle x=\frac{V_f^2-V_o^2}{2a}

Reemplazando valores:

\displaystyle x=\frac{19.4^2-30.5^2}{2*(-3)}

\displaystyle x=\frac{-553.89}{-6}

x = 92.315 m

El automovilista recorrió 92.315 metros

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Answer:

A= 61.35

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Explanation:

1. Using the components method we have:

A_{x}= A cos \alpha\\B_{x}= B cos \beta\\C_{x}= 0\\\\A_{y}= A sin \alpha\\B_{y}= B sin \beta\\C_{y}= 24.6\\

Considering that the vector sum A+B+C=0, then:

|V|=\sqrt{V_{x}^{2} +V_{y}^{2} }=0

Then:

V_{x} ^{2} =0; V_{x} =0\\V_{y} ^{2} =0; V_{y} =0

It means the value of x and y component is 0.

2. Determinate the equations that describe each component:

V_{x}= A cos \alpha -B cos \beta=0  (1)\\V_{y}= A sin \alpha +B sin \beta - C=0   (2)

Form Eq. (1):

A=B \frac{cos \beta}{cos \alpha}     (3)

Replacing A in Eq. (2):

(B\frac{cos \beta}{cos \alpha})(sin \alpha)+ B sin\beta-C=0\\(B\frac{cos \beta}{cos \alpha})(sin \alpha)+ B sin\beta-=C\\\\B(\frac{cos \beta. sin \alpha}{cos \alpha}+ sin\beta)=C\\B=C(\frac{cos \beta. sin \alpha}{cos \alpha}+ sin\beta)^{-1}     (4)

Replacing values of C, α and β in (4):

B= 24.6 (\frac{(cos 27.7)(sin 44.9)}{cos 44.9}+sin 27.7)^{-1}  \\B= -44.4

Replacing value of B in (3)

A=-44.40\frac{cos 27.7}{sin 49.9} \\A= 61.35

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3 years ago
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Objects want to continue doing what they’re doing because they are “lazy.” This is called law of inertia.

Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that state unless it is being acted upon by an external force. This law is also called the law of inertia because it depends on mass.

<em>From the given question, we can </em><em>fill gaps </em><em>as follows;</em>

Objects want to continue doing what they’re doing because they are “lazy.” This is called law of inertia.

Learn more about Newton's first law of motion here: brainly.com/question/10454047

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An object is five focal lengths from a concave mirror.how do the object and image heights compare?
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In addition, a concave mirror will have a positive focal length (f) and a convex mirror will have a negative focal length (f).

Now, we then have 1/f = 1/5f + 1/s’ which is s’ = 5f/4

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