Answer:
C. less than 950 N.
Explanation:
Given that
Force in north direction F₁ = 500 N
Force in the northwest F₂ = 450 N
Lets take resultant force R
The angle between force = θ
θ = 45°
The resultant force R
![R=\sqrt{F_1^2+F_2^2+2F_1F_2cos\theta}](https://tex.z-dn.net/?f=R%3D%5Csqrt%7BF_1%5E2%2BF_2%5E2%2B2F_1F_2cos%5Ctheta%7D)
![R=\sqrt{500^2+450^2+2\times 450\times 500\times cos\theta}](https://tex.z-dn.net/?f=R%3D%5Csqrt%7B500%5E2%2B450%5E2%2B2%5Ctimes%20450%5Ctimes%20500%5Ctimes%20cos%5Ctheta%7D)
R= 877.89 N
Therefore resultant force is less than 950 N.
C. less than 950 N
Note- When these two force will act in the same direction then the resultant force will be 950 N.
When it comes to optics, Snell's law is the basic formula to be used. If you notice, when light hits the water, the light does not travel in the same direction. After, it hits the water, it changes in angle. Light becomes refracted. This is observed when your hands tend to become bigger if you place it underwater. The formula for Snell's Law is
n₁ sin θ₁ = n₂sin θ₂, where n is the index of refraction. This depends on the type of medium. For example, for air, n=1. The parameters θ₁ is the angle of incidence, and θ₂ is the angle of refraction. Critical angle is the incident angle needed so that the refract angle is 90°. So, modifying the equation:
n₁ sin θcrit = n₂sin 90°, since sin 90°=1,
sin θcrit = n₂/n₁
θcrit = sin ⁻¹ (n₂/n₁)
Since liquid comes first before glass, n₁=1.75 and n₂=1.52. Substituting,
θcrit = sin ⁻¹ (1.52/1.75)
θcrit = 60.29°
Answer:
Sound waves bend around the corners of various obstacles.
Explanation:
I took the test
Answer:
B.
340meters per second x 2 seconds = 680 meters away
divided by 2coming back = 340
Hope this helps
Explanation: