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kolbaska11 [484]
3 years ago
8

A train travels 67 kilometers in 1 hours, and then 81 kilometers in 5 hours. What is its average speed?

Physics
1 answer:
Naddika [18.5K]3 years ago
4 0
Answer: 24.7 km/h

Explanation:

1) Average speed definition and formula

The average speed is the total distance run divided by the time elapsed:

S = distance / time

2) Distance 1 = 67 km

3) Distance 2 = 81 km

4) Total distance traveled = 67 km + 81 km = 148 km

5) time 1 = 1 hour

6) time 2 = 5 hours

7) total time = time 1 + time 2 = 1 h + 5 h = 6 h

8) Average speed:

S = 148 km / 6 h = 24.7 km/h


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A chemical change can be represented by ____________ changing into _____________ in a ________________.
Harrizon [31]

Answer:

I don't know but I explain some of it as best as I can

Explanation:

Substances that start a chemical reaction are called reactants. Substances that are produced in the reaction are called products. Reactants and products can be elements or compounds. Bonds break in the reactants and new bonds form in the products.

3 0
3 years ago
Which statement correctly describes one of the changes?
Dima020 [189]

It'd be A. Picture one shows a chemical change. Rust is made from the iron reacting with oxygen.

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4 years ago
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Which number should be placed in the blank to make the equation balance? 3 H2+ N2 --- ______ NH3
miv72 [106K]
2 should be placed in the blank to make the equation balance. Btw, that's chemistry and not physics. Get it right.
7 0
3 years ago
Chris and Sue are wearing harnesses and are hanging from the ceiling by means of ropes attached to them. They are face to face a
Setler [38]

Answer:

h = 0.288m

Explanation:

Assume

v_1 = Speed of Sue

v_2 = Speed of Chris immediately after the push

Sue's KE = \frac{1}{2} mv_1\ ^2 = 26 v_1 \ ^2

now she swings this is converted into gravitation at PE of

mg n = 52 × 9.8 × 0.65  

= 331.24

26v_{1}\ ^2 = 331.24

So, v_1 = 3.569

They started at rest by conservation of momentum in case of push off the magnitude of sue momentum and it is equal to the magnitude of Chris momentum in the opposite or inverse direction

m_1v_1 = m_2v_2

52 \times 3.569  = 78 \times v_2

v_2 = 2.380

Chris kt = \frac{1}{2} \times 78 \times 2.380^2

= 220.827

220.827 = mgh

So, h = 0.288m

3 0
3 years ago
En un instante pasa por A un cuerpo con MRU de 20 m/seg, 5 segundos después pasa en su persecución, por el mismo punto A otro cu
sukhopar [10]

Answer:

Los cuerpos se encuentran luego de 15 segundos a los 300 metros.

Explanation:

El movimiento rectilíneo uniforme (MRU) es el movimiento que describe un cuerpo o partícula a través de una línea recta a velocidad constante. Es decir, que en este caso el movimiento es lineal en una única dirección  y la velocidad de desplazamiento es constante.

La posición del cuerpo después de un tiempo se calcula a partir de la posición inicial y de la velocidad del cuerpo mediante la expresión:

x=x0+v⋅t

donde:

  • x0 es la posición inicial.
  • v es la velocidad que tiene el cuerpo a lo largo del movimiento.
  • t es el intervalo de tiempo durante el cual se mueve el cuerpo.

En este caso, si el tiempo empleado por el primer cuerpo es t, el del segundo que sale 5 segundos más tarde será t-5. Siendo la velocidad del primer cuerpo 20 m/s y la del segundo cuerpo 30 m/s, entones la posición de cada uno será:

x1 = 20 m/s* t

x2 = 30 m/s* (t - 5 s)

Ambos se encuentran cuando sus posiciones son iguales:

x2=x1

30*(t - 5) = 20*t

30*t - 30*5= 20*t

30*t - 150 = 20 t

30*t - 20*t= 150

10*t= 150

t= 150÷10

t=15 segundos

Reemplazando en la expresiones de posición obtienes:

x1 = 20 m/s* 15 s= 300 m

x2 = 30 m/s* (15 s - 5 s)= 300 m

<u><em>Los cuerpos se encuentran luego de 15 segundos a los 300 metros.</em></u>

3 0
3 years ago
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