Grass dear wolf is the right awnser
Answer:
![n = \frac{c}{v}](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7Bc%7D%7Bv%7D)
Explanation:
Refractive Index: It is a measure to find how fast the light travels through a medium. It is ration of the speed of light in vacuum to speed of light in the medium. Speed of light is not constant and varies depending on the density of the medium.
In vacuum the speed of light is 300000 km/s and is denoted by c. When the light beam enters any medium the speed will decrease. Here it is given that the speed in plastic is v. Thus the refractive index(n) is given as:
![n = \frac{c}{v}](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7Bc%7D%7Bv%7D)
It is a dimensionless no.
Answer:
Pressure applied by the man= 285103.125
or 41.35 ![lb/in^{2}](https://tex.z-dn.net/?f=lb%2Fin%5E%7B2%7D)
Explanation:
Pressure is defined as the perpendicular force applied per unit area.
i.e. ![Pressure=\frac{Force}{Area}](https://tex.z-dn.net/?f=Pressure%3D%5Cfrac%7BForce%7D%7BArea%7D)
Now, ![Force= mg](https://tex.z-dn.net/?f=Force%3D%20mg)
where,
= mass of the body(man) = 93 kg
= acceleration due to gravity of Earth = 9.81 ![m/{s^{2}}](https://tex.z-dn.net/?f=m%2F%7Bs%5E%7B2%7D%7D)
covered is equal to the area of both stilts(a man generally stands on two feet)
therefore
![m^{2}](https://tex.z-dn.net/?f=m%5E%7B2%7D)
and putting in the values, we get,
![Pressure=\frac{93\times9.81}{2\times(0.04)^{2}}Nm^{-2}=285103.125Nm^{-2}](https://tex.z-dn.net/?f=Pressure%3D%5Cfrac%7B93%5Ctimes9.81%7D%7B2%5Ctimes%280.04%29%5E%7B2%7D%7DNm%5E%7B-2%7D%3D285103.125Nm%5E%7B-2%7D)
Now we need to convert to our required units:
![1Nm^{-2}=1Pa\\1Pa=0.000145038lb/in^{2}](https://tex.z-dn.net/?f=1Nm%5E%7B-2%7D%3D1Pa%5C%5C1Pa%3D0.000145038lb%2Fin%5E%7B2%7D)
(We can get the above result by individually converting kg to lb and meters to inches respectively)
Using the above relations we get,
![Pressure=285103.125Pa=0.000145038\times285103.125lb/in^{2}=41.35lb/in^{2}](https://tex.z-dn.net/?f=Pressure%3D285103.125Pa%3D0.000145038%5Ctimes285103.125lb%2Fin%5E%7B2%7D%3D41.35lb%2Fin%5E%7B2%7D)
Answer:
![1.7\cdot 10^3 N](https://tex.z-dn.net/?f=1.7%5Ccdot%2010%5E3%20N)
Explanation:
The impulse theorem states that the product between the force and the time interval of the collision is equal to the change in momentum:
![F \Delta t = m \Delta v](https://tex.z-dn.net/?f=F%20%5CDelta%20t%20%3D%20m%20%5CDelta%20v)
where
F is the force
is the time interval
m is the mass
is the change in velocity
Here we have
m = 84 kg
![\Delta t = 1.2 s](https://tex.z-dn.net/?f=%5CDelta%20t%20%3D%201.2%20s)
![\Delta v = 24 m/s](https://tex.z-dn.net/?f=%5CDelta%20v%20%3D%2024%20m%2Fs)
So we can solve the equation to find the force:
![F= \frac{m \Delta v}{\Delta t }=\frac{(84 kg)(24 m/s)}{1.2 s}=1680 N \sim 1.7\cdot 10^3 N](https://tex.z-dn.net/?f=F%3D%20%5Cfrac%7Bm%20%5CDelta%20v%7D%7B%5CDelta%20t%20%7D%3D%5Cfrac%7B%2884%20kg%29%2824%20m%2Fs%29%7D%7B1.2%20s%7D%3D1680%20N%20%5Csim%201.7%5Ccdot%2010%5E3%20N)
Answer:
I think B
Explanation:
Russia is the largest country on the planet, and due to the immense size it could experience more temperature differences.