Answer:
A) a frictional force is acting on it
Explanation:
The crate is sliding down the inclined ramp at constant velocity: constant velocity means zero acceleration, a = 0. According to Newton's second law:
F = ma
this also means that the net force acting along the direction of the slope is zero.
Without frictional force, there would be only one force acting along this direction: the component of the weight of the crane parallel to the slope, acting downward:
where 
is the angle of the incline. Therefore, the net force along this direction would not be zero. In order to have a net force of zero, there must be another force acting upward on the crate: and the only force that is possibly acting on the crate against its direction of motion is the frictional force, whose magnitude must be equal to 
, in order to produce a net force of zero (and therefore, a zero acceleration).
Forward because things that are in motion stay in motion.
Hope that helped!
~Izzy
Answer:
Conociendo la velocidad inicial del proyectil y el angulo de lanzamiento con respecto ala horizontal.
Explanation:
Para poder anticipar la caída del proyectil es importante conocer la velocidad inicial del proyectil y el angulo de disparo del proyectil con respecto a la horizontal.
A continuación se presenta un diagrama o esquema donde se pueden ver estas variables y se explicaran a la brevedad:
Para poder encontrar el rango que es la máxima distancia horizontal recorrida por el proyectil debemos utilizar la siguiente ecuación:
![x=(v_{o})_{x} *t\\where:\\(v_{o})_{x} = velocidad inicial x-component [m/s]\\t= time [s]](https://tex.z-dn.net/?f=x%3D%28v_%7Bo%7D%29_%7Bx%7D%20%2At%5C%5Cwhere%3A%5C%5C%28v_%7Bo%7D%29_%7Bx%7D%20%3D%20velocidad%20inicial%20%20x-component%20%5Bm%2Fs%5D%5C%5Ct%3D%20time%20%5Bs%5D)
Para poder encontrar el tiempo debemos utilizar la siguiente ecuación:
![y=(v_{y} )_{o}*t-0.5*g*t^{2} \\donde:\\(v_{y} )_{o}= velocidad inicial componente y [m/s]\\g = gravity = 9.81 [m/s^2]\\t = time [s]](https://tex.z-dn.net/?f=y%3D%28v_%7By%7D%20%29_%7Bo%7D%2At-0.5%2Ag%2At%5E%7B2%7D%20%20%5C%5Cdonde%3A%5C%5C%28v_%7By%7D%20%29_%7Bo%7D%3D%20velocidad%20inicial%20componente%20y%20%5Bm%2Fs%5D%5C%5Cg%20%3D%20gravity%20%3D%209.81%20%5Bm%2Fs%5E2%5D%5C%5Ct%20%3D%20time%20%5Bs%5D)
En la anterior ecuación, igualamos y = 0, ya que cuando el proyectil cae al suelo la distancia vertical es cero. De esta manera podemos encontrar el tiempo t, ya que conocemos la velocidad inicial del proyectil en la componente y.
Seguidamente reemplazamos t en la primera ecuacion y encontramos la distancia x o el rango.
The answer is variant C because every living organism needs water to survive. A human can live without water only 6 days, after that period the most important organs start to shut down because of the lack of water.
Answer:
Height, H = 25.04 meters
Explanation:
Initially the ball is at rest, u = 0
Time taken to fall to the ground, t = 2.261 s
Let H is the height from which the ball is released. It can be calculated using the second equation of motion as :
Here, a = g
H = 25.04 meters
So, the ball is released form a height of 25.04 meters. Hence, this is the required solution.
