1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kifflom [539]
3 years ago
14

Un coche que lleva una velocidad constante de 90 km/hora durante 2 horas ¿Cuánto espacio recorre?Si encuentra un obstáculo en la

carrera y tiene que parar 10 segundos calcula la aceleración
Physics
1 answer:
Kisachek [45]3 years ago
4 0

Answer:

(i) El coche recorre 180 kilómetros.

(ii) El coche decelera a razón de 2.5 metros por segundo al cuadrado.

Explanation:

El problema se divide en dos partes. La primera es el coche viajando a velocidad constante y la segunda consiste en una decelaración hasta alcanzar el reposo.

Primera parte - Viaje a velocidad constante

La distancia recorrida por el coche se calcula mediante la siguiente ecuación cinemática:

x = v\cdot t (1)

Donde:

x - Distancia recorrida, en kilómetros.

v - Velocidad, en kilómetros por hora.

t - Tiempo, en horas.

Si sabemos que v = 90\,\frac{km}{h} y t = 2\,h, entonces la distancia recorrida por el coche es:

x = v\cdot t

x = 180\,km

El coche recorre 180 kilómetros.

Segunda parte - Deceleración

Asumiendo que la deceleración del coche es constante, se determina mediante la siguiente ecuación cinemática:

a = \frac{v-v_{o}}{t} (2)

Donde:

v_{o} - Velocidad inicial, en metros por segundo.

v - Velocidad final, en metros por segundo.

t - Tiempo, en segundos.

Si sabemos que v_{o} = 25\,\frac{m}{s}, v = 0\,\frac{m}{s} y t = 10\,s, entonces la deceleración experimentada por el coche es:

a = -2.5\,\frac{m}{s^{2}}

El coche decelera a razón de 2.5 metros por segundo al cuadrado.

You might be interested in
Physics pls help
seropon [69]
First one is correct
3 0
3 years ago
Read 2 more answers
Vector A⃗ points in the positive y direction and has a magnitude of 12 m. Vector B⃗ has a magnitude of 33 m and points in the ne
gavmur [86]

vector A has magnitude 12 m and direction +y

so we can say

\vec A = 12 \hat j

vector B has magnitude 33 m and direction - x

\vec B = -33 \hat i

Now the resultant of vector A and B is given as

\vec A + \vec B = 12 \hat j - 33 \hat i

now for direction of the two vectors resultant will be given as

\theta = tan^{-1}\frac{12}{-33}

\theta = 160 degree

so it is inclined at 160 degree counterclockwise from + x axis

magnitude of A and B will be

R = \sqrt{A^2 + B^2}

R = \sqrt{12^2 + 33^2} = 35.11 m

so magnitude will be 35.11 m

6 0
3 years ago
In many cartoon shows, a character runs of a cliff, realizes his predicament and lets out a scream. He continues to scream as he
Rzqust [24]

Answer:

Increasing until terminal velocity is reached

Explanation:

Provided the scream is a constant pitch at the source, Doppler effect will make the pitch increase as the velocity of the source towards the listener increases.

5 0
3 years ago
What is the mechanical advantage of a single pulley
Viktor [21]

the answer is 1 because a single pulley has 1 rope


5 0
3 years ago
Read 2 more answers
What is the best description of a mechanical wave?
gizmo_the_mogwai [7]

Answer:

A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.

Explanation:

8 0
3 years ago
Other questions:
  • An explosion that destroys a massive star is called a
    9·2 answers
  • A rubber toy duck is at rest on an inclined plane. When the angle of inclination of the plane is increased to 36.0°, the toy duc
    14·1 answer
  • A toy car starts from rest 0.650m from the edge of a table. The car accelerates at 2.50 m/s^2 until it leaves the table. The toy
    7·1 answer
  • Explain Kepler's second law in detail with figures.
    5·1 answer
  • Based on the diagram of a ball rolling down hill, what statement is true? A) The ball in box C has less kinetic energy than the
    6·1 answer
  • How do the magnitudes of the inertial (the density times acceleration term), pressure, and viscous terms in the Navier-Stokes eq
    15·1 answer
  • Light that is polarized along the vertical direction is incident on a sheet of polarizing material. Only 92% of the intensity of
    14·1 answer
  • Electricity produces work when the electrons in a conductor
    8·2 answers
  • A. With what speed must a ball be thrown vertically from ground level to rise to a maximum height of 45m?
    14·1 answer
  • You need to calculate the volume of berm that has a starting cross-sectional area of 118 SF, and an ending cross-sectional area
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!