Answer:
El conductor no puede evitar el choque.
Explanation:
Primero, convierta la velocidad del conductor a m / s:
1 km/h = 0.277778 m/s
126 km/h = 126 * 0.277778 = 35 m/s
La velocidad del automóvil es de 35 m / s.
El conductor presiona los frenos con una aceleración de -3.5 m / s² para evitar un choque a 150 m por delante.
Veamos qué distancia se moverá el automóvil después de que comience a desacelerar.
Utilizaremos una de las ecuaciones de movimiento lineal de Newton:
![v^2 = u^2 + 2as](https://tex.z-dn.net/?f=v%5E2%20%3D%20u%5E2%20%2B%202as)
donde v = velocidad final = 0 m / s (el automóvil debe detenerse)
u = velocidad inicial = 35 m / s
a = aceleración = -3.5 m / s².
s = distancia recorrida
Por lo tanto:
![0 = 35^2 + (2 * -3.5 * s)\\\\=> 1225 = 7.0s\\\\s = 1225 / 7 = 175 m](https://tex.z-dn.net/?f=0%20%3D%2035%5E2%20%2B%20%282%20%2A%20-3.5%20%2A%20s%29%5C%5C%5C%5C%3D%3E%201225%20%3D%207.0s%5C%5C%5C%5Cs%20%3D%201225%20%2F%207%20%3D%20175%20m)
Esto significa que el automóvil se detendrá a 175 m.
Por lo tanto, a esa velocidad y aceleración, el conductor chocará contra el árbol caído porque el automóvil no podrá detenerse antes de alcanzar la posición del árbol.
ANS: The correct answer to the question is coefficient of friction.
EXPLANATION:
Let us consider a body resting on a table. The weight of the body is acting in vertical downward direction. The table also exerts an equal amount of force perpendicular to the surface of the body which is called normal reaction.
Here, normal reaction [N] = Weight [W]
Let an external force is applied on the body which will cause motion on the body. As the body is resting on the floor, friction will come into existence which will oppose the relative motion between table and body.
Let F is the force of friction.
The force of friction is directly proportional to the normal reaction. Mathematically we may write F ∝ N
![F=\mu N](https://tex.z-dn.net/?f=F%3D%5Cmu%20N)
Here,
is a proportionality constant called the coefficient of friction.
![The\ coefficient\ of\ friction\ \mu=\frac{F}{N}](https://tex.z-dn.net/?f=The%5C%20coefficient%5C%20of%5C%20friction%5C%20%5Cmu%3D%5Cfrac%7BF%7D%7BN%7D)
⇒
[∵N= W]
From above, it is obvious that coefficient of friction is a unitless quantity.
Hence, the amount of friction divided by the weight of an object forms a unitless number called the coefficient of friction.
Explanation:
potential energy = mass × gravity force × height
=20 × 10 × 25
= 5000 joules
Answer:
Solution A is 1 x 10⁵ times more acidic than solution B
Explanation:
The pH scale is a logarithmic scale used to express the acidity or basicity of a solution.
The values are written from 1 - 14 with 1 being the most acidic and 14 a basic solution.
Each interval is ten folds more concentrated than the next because it is a logarithmic scale.
Since the pH of A = 3.4
pH of B = 8.4
The difference = 8.4 - 3.4 = 5.0
So, Solution A is 1 x 10⁵ times more acidic than solution B