Also B. Water is the solvent is correct
Answer: 31.62°
Explanation:
Tenemos como datos:
Distancia = 18.0m
Velocidad inicial = 2.0 m/s
Tiempo total = 3.3s
Sabemos que para un plano inclinado (ignorando el rozamiento) la aceleración se escribe como:
a(t) = g*sen(θ)
donde θ es el ángulo del plano inclinado, y g = 9.8m/s^2
Sabemos que para la velocidad tenemos que integrar la aceleración sobre el tiempo, entonces:
v(t) = g*sen(θ)*t + v0
Donde v0 es la velocidad inicial: v0 = 2.0m/s
v(t) = 9.8m/s^2*sen(θ)*t + 2.0m/s
Y para la posición, podemos integrar de vuelta sobre el tiempo:
p(t) = 0.5*9.8m/s^2*sen(θ)*t^2 + 2.0m/s*t + p0
Donde p0 es la posición inicial, podemos considerar que es cero para este problema.
p(t) = 4.9m/s^2*sen(θ)*t^2 + 2.0m/s*t
Y usando los datos iniciales, sabemos que en 3.3 segundos se recorren 18 metros, entonces:
p(3.3s) = 18m = 4.9m/s^2*sen(θ)*(3.3s)^2 + 2.0m/s*3.3s
18m = 51.744m*sen(θ) + 6.6m
sen(θ) = (18m - 6.6m)/ 51.744m
θ = cosec( (18m - 6.6m)/ 51.744m ) = 31.62°
<u>[Reflection]</u>
- This occurs when light bounces off a surface (reflection is when light bounces off of something, a medium, but doesn't go through.)
- Best with a smooth surface (it is easiest for light to bounce off when the surface is smooth)
- If not for this behavior, mirrors wouldn't work (mirrors use reflection, if they did not you would not be able to see your <em>reflection</em>)
<u>[Refraction]</u>
- Light moves from one medium to another (when light moves from one medium to another, it refracts)
- Lenses in your glasses to bend light waves (refraction is all about bending light waves, so this option falls under this category)
- Microscopes and telescopes take advantage of this behavior of light (again, refraction is bending light waves. When you bend a light wave, it can make it easier to see [larger, smaller, etc] so this option is refraction)
- Light wave changes speed (light does not change speed when being reflected because it is in the same medium and just bouncing, but it refraction is changes mediums so it will bend and change speed)
[Note]
- Some of these can be figured out by knowing the definitions. For example, refraction is defined as "change in direction ... of any wave as a result of its traveling at different speeds at different points along the wave front" (Oxf/ord Languages)
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.
