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Irina-Kira [14]
3 years ago
6

I could really use some help on this question guys! Will give brainliest!

Physics
2 answers:
aev [14]3 years ago
4 0

Answer:

I think it’s the third one

REY [17]3 years ago
3 0
I think it’s the Third one , hope this helps
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As the load increases the motor generally reduces rpm, as the happens the counter emf generated in the armature decreases, causing more current to flow to

Explanation:

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3 years ago
Nicole built a parachute, as seen here. She dropped the parachute from the top of the stairs, and it floated down very quickly.
siniylev [52]

answer C

Explanation:

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2 years ago
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Find the sum of the following vectors A=3i-12j and B=4i+7j<br><br>​
Lady_Fox [76]

Answer:

(I). The sum of the vectors is (7i-5j).

(II). The sum of the vectors is (8i+7j).

Explanation:

Given that,

(I). Vector A A=3i-12j

Vector B B=4i+7j

Suppose, (II). Vector A A=6i+15j

Vector B B=2i-8j

(I). We need to calculate the sum of the vectors

Using formula of sum

\vec{C}=\vec{A}+\vec{B}

Where,

\vec{A}= vector A

\vec{B}= vector B

\vec{C}= sum of the vector A and bPut the value into the formula[tex]\vec{C}=(3i-12j)+(4i+7j)

\vec{C}=7i-5j

(II). We need to calculate the sum of the vectors

Using formula of sum

\vec{C}=\vec{A}+\vec{B}

Put the value into the formula

\vec{C}=(6i+15j)+(2i-8j)

\vec{C}=8i+7j

Hence, The sum of the vectors is (7i-5j).

The sum of the vectors is (8i+7j).

8 0
3 years ago
Es muy común que cuando se viaja hacia un río o lago se juegue "ranita", el cual consiste en lanzar una piedra horizontalmente h
shutvik [7]

Answer:

a) La piedra es lanzada desde una altura de 0,785 metros.

b) La piedra es lanzada con una velocidad inicial de 6,25 metros por segundo.

Explanation:

a) Dado que la piedra es lanzada horizontalmente, tenemos que la piedra experimenta un movimiento horizontal a velocidad constante y uno vertical uniformemente acelerado debido a la gravedad. La altura de la que fue lanzada la piedra se puede determinar mediante la siguiente ecuación cinemática:

y = y_{o}+v_{o,y}\cdot t +\frac{1}{2}\cdot g\cdot t^{2} (1)

Donde:

y - Altura final, medida en metros.

y_{o} - Altura inicial, medida en metros.

v_{o,y} - Componente vertical de la velocidad inicial, medida en metros por segundo.

t - Tiempo, medido en segundos.

g - Aceleración gravitacional, medida en metros por segundo cuadrado.

Si sabemos que y = 0\,m, v_{o,y} = 0\,\frac{m}{s}, t = 0,4\,s y g = -9,807\,\frac{m}{s^{2}}, entonces la altura inicial de la piedra es:

y_{o} = y-v_{o,y}\cdot t -\frac{1}{2}\cdot g\cdot t^{2}

y_{o} = 0\,m-\left(0\,\frac{m}{s} \right)\cdot (0,4\,s)-\frac{1}{2}\cdot \left(-9,807\,\frac{m}{s^{2}} \right) \cdot (0,4\,s)^{2}

y_{o} = 0,785\,m

La piedra es lanzada desde una altura de 0,785 metros.

b) Ahora, obtenemos el componente horizontal de la velocidad inicial a partir de la siguiente ecuación cinemática:

v_{o,x} = \frac{x-x_{o}}{t} (2)

Donde:

x_{o}, x - Posiciones horizontales iniciales y finales, medidas en metros.

t - Tiempo, medido en segundos.

Si tenemos que x_{o} = 0\,m, x = 2,5\,m y t = 0,4\,s, entonces el componente horizontal de la velocidad inicial es:

v_{o,x} = \frac{2,5\,m-0\,m}{0,4\,s}

v_{o,x} = 6,25\,\frac{m}{s}

La piedra es lanzada con una velocidad inicial de 6,25 metros por segundo.

4 0
3 years ago
Study the drawings below. Choose the drawing that is most likely a mixture.
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There is no attached picture. Please insert one so I can help out! :)

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