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NARA [144]
3 years ago
9

Helpppppppppppppphxhxhxhxhx

Mathematics
1 answer:
pychu [463]3 years ago
4 0

Answer:

C  \frac{48}{70}

Step-by-step explanation:

Option C - \frac{48}{70} is incorrect because when multiplying the numerator and denominator of the fraction \frac{7}{10} by 7, you’re suppose to get \frac{49}{70}.

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Una lancha que viaja a 10 m/s pasa por debajo de un puente 3 segundos después que ha pasado un bote que viaja a 7 m/s, ¿después
ExtremeBDS [4]

Answer:

La lancha y el bote se encontrarán a 70 metros de distancia del puente.

Step-by-step explanation:

Sea el punto debajo del puente el punto de referencia y que ambas lanchas se desplazan a velocidad a continuación, las ecuaciones cinemáticas para cada embarcación son presentadas a continuación:

Bote a 7 metros por segundo

x_{A} = x_{o}+v_{A}\cdot t (Ec. 1)

Lancha a 10 metros por segundo

x_{B} = x_{o}+v_{B}\cdot (t-3\,s) (Ec. 2)

Donde:

x_{o} - Posición debajo del puente, medido en metros.

x_{A}, x_{B} - Posición final de cada embarcación, medido en metros.

v_{A}, v_{B} - Velocidad de cada embarcación, medida en metros por segundo.

t - Tiempo, medido en segundos.

Para determinar la posición en la que ambas embarcaciones se encuentran, se debe determinar el instante en que ocurre a partir de la siguiente condición: x_{A} = x_{B}

Igualando (Ec. 1) y (Ec. 2) se tiene que:

v_{A}\cdot t = v_{B}\cdot (t-3\,s)

Ahora despejamos el tiempo:

3\cdot v_{B} = (v_{B}-v_{A})\cdot t

t = \frac{3\cdot v_{B}}{v_{B}-v_{A}}

Si sabemos que v_{B} = 10\,\frac{m}{s} y v_{A} = 7\,\frac{m}{s}, entonces:

t = \frac{3\cdot \left(10\,\frac{m}{s} \right)}{10\,\frac{m}{s}-7\,\frac{m}{s}}

t = 10\,s

Ahora, la posición de encuentro es: (x_{o} = 0\,m, v_{A} = 7\,\frac{m}{s} y t = 10\,s)

x_{A} = 0\,m + \left(7\,\frac{m}{s} \right)\cdot (10\,s)

x_{A} = 70\,m

La lancha y el bote se encontrarán a 70 metros de distancia del puente.

6 0
3 years ago
Stonehenge is one of the most famous historical sites in the world. It is believed to
julia-pushkina [17]

Answer: Radius is 15.9975 meters.

Step-by-step explanation:

The formula to find radius of circle is r=\sqrt{A/\pi } so plug in our known variables and solve...

r=\sqrt{804/\pi }

r=\sqrt{255.9211}

r=15.9975

8 0
3 years ago
Is this linear or not and why
Fittoniya [83]

Answer:

  • Yes

Step-by-step explanation:

Both equations of this system are of degree one.

They are both linear as the graph of both is a line.

5 0
3 years ago
Read 2 more answers
Im just going to post a picture ​
xz_007 [3.2K]

Answer:

the picture is hard

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Where does the point (0, - 3) lie?
White raven [17]

This point falls on none of your possible answers.

We can first tell that it falls neither positive or negative in terms of x since the x value is 0.

We can also tell the y term is negative. Therefore, it would fall on the negative y-axis.

3 0
3 years ago
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