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VARVARA [1.3K]
3 years ago
14

Example 9.1

Physics
1 answer:
docker41 [41]3 years ago
6 0

v1f = -0.16 ms

Explanation:

Use the conservation law of linear momentum:

m1v1i + m2v2i = m1v1f + m2v2f

where

v1i = v2i = 0

m1 = 160 kg

m2 = 0.50 kg

v2f = 50m/s

v1f = ?

So we have

0 = (160 kg)v1f + (0.5 kg)(50 m/s)

v1f = -(25 kg-m/s)/(160 kg)

= -0.16 m/s

Note: the negative sign means that its direction is opposite that of the arrow.

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Un ciclista recorre 10 km en 2 h.Calcula su velocidad media en km/h.¿cuantos metros recorre cada segundo
lys-0071 [83]

Answer:

La velocidad media es 5 \frac{km}{h}, que equivale a 1.389 \frac{m}{s}

Explanation:

La velocidad es una magnitud física que expresa la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello.

La velocidad media relaciona el cambio de la posición con el tiempo empleado en efectuar dicho cambio. Por lo que se calcula como la distancia recorrida por un objeto dividido por el tiempo transcurrido:

velocidad=\frac{distancia}{tiempo}

En este caso:

  • distancia= 10 km= 10,000 m (siendo 1 km= 1,000 m)
  • tiempo= 2 h= 7,200 s (siendo 1 h= 3,600 s)

Entonces, reemplazando en la definición de velocidad media:

velocidad=\frac{10 km}{2 h}= \frac{10,000 m}{7,200 s}

Resolviendo se obtiene:

velocidad=5 \frac{km}{h}= 1.389\frac{m}{s}

<u><em>La velocidad media es 5 </em></u>\frac{km}{h}<u><em>, que equivale a 1.389 </em></u>\frac{m}{s}<u><em></em></u>

4 0
3 years ago
When you have been swimming swimming and you come out of the pool, you may feel cold. Use your understanding of endothermic proc
Leona [35]

Explanation:

Edothermic process is the absorbtion of heat.

It is the opposite of exothermic process which is the release of energy. In edothermic process thermal energy is absorbed from the surrounding

4 0
3 years ago
The slope of a line on a distance-time graph represents _____. distance time displacement speed
lisabon 2012 [21]

Answer:

speed

Explanation:

The slope of a  line on any distance-time graph represents the speed of the object.

Velocity  only comes in when there is speed of the object in a particular direction.

4 0
3 years ago
Which of the following is a reason for the start of the space race?
Mariana [72]
Answer #4, because they wanted to show that they are the best
7 0
4 years ago
A man walks 3.50 mi due east, then turns and walks 2.57 mi due north. How far
BaLLatris [955]

Answer:

4.34 mi at 36.3^{\circ} north of east

Explanation:

The displacement of an object in motion is a vector connecting its initial position to the final position of motion.

In this problem, the man has 2 different motions:

- 3.50 mi due east

- 2.57 mi due north

We can take the east direction as positive x-direction and north as positive y-direction, so these two motions can be written as:

x=+3.50 mi

y=+2.57 mi

Since the two motions are perpendicular to each other, the resultant displacement can be found by using Pythagorean's theorem; therefore:

d=\sqrt{x^2+y^2}=\sqrt{3.50^2+2.57^2}=4.34 mi

We can also find the direction using the equation:

tan \theta = \frac{y}{x}

And therefore,

\theta=tan^{-1}(\frac{y}{x})=tan^{-1}(\frac{2.57}{3.50})=36.3^{\circ}

7 0
4 years ago
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