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Ludmilka [50]
1 year ago
13

What's h-4/j = k solve for j.

Mathematics
1 answer:
Shtirlitz [24]1 year ago
6 0
H-4/j=k
-4/j=k-h
j=k-h/-4
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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
Select the points on circle B . <br><br><br>F<br><br><br>M <br><br><br>B <br><br><br>J
trasher [3.6K]

Answer:

F, M, and J.

Step-by-step explanation:

7 0
3 years ago
Solving for x... please help me....​
geniusboy [140]

Answer:

A) 11

Step-by-step explaination:

CE = 2x - 2

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6 0
3 years ago
100 POINTS plz help Chuck drops a rock from a height of 70 m. How long will it take the rock to hit the ground?
lord [1]

Answer:

3.8

Step-by-step explanation:

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Now we will find the a b and c of the equation,  a=-4.9 b=0 c=70

Now we must find the discriminant of the equation,  which the equation for that is D=b^2+(-4)(a)(c)

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Write -12 7/8 as a decimal. (NEED ASAP WITH WORK)
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7/8 can be converted to .875 because 1/8 is .125 and .125*7=.875. Add -12 to it so the answer is -12.875
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