Answer:
With all of that information, he's telling us the train's VELOCITY.
Explanation:
Velocity is a vector quantity made of two parts: speed and direction.
The pressure acting on an area of 20 m² with force 50 N is 2.5 Nm² and the pressure acting on an area of 0.5 m² with force 50 N is 100 Nm².
The force acting on area of 3 m² with pressure 10 Pa is 30 N.
Explanation:
Pressure acting on any surface is the amount of force experienced by that surface in a given area. So it is the ratio of force to area of the object under consideration.
As here the force is said to be 50 N and the area is said to be 20 m², the pressure will be
![Pressure = \frac{Force}{Area} = \frac{50}{20}=2.5 Nm^{2}](https://tex.z-dn.net/?f=Pressure%20%3D%20%5Cfrac%7BForce%7D%7BArea%7D%20%3D%20%5Cfrac%7B50%7D%7B20%7D%3D2.5%20Nm%5E%7B2%7D)
So, pressure is inversely proportional to the area and directly proportional to the force acting on the surface. As it can be seen that on decreasing the area to 0.5 m², there will be increase in the pressure as shown below,
![Pressure = \frac{50}{0.5} = 100 Nm^{2}](https://tex.z-dn.net/?f=Pressure%20%3D%20%5Cfrac%7B50%7D%7B0.5%7D%20%3D%20100%20Nm%5E%7B2%7D)
Thus, the pressure increased to 100 Nm² from 2.5 Nm² on decreasing the area from 20 m² to 0.5 m².
Similarly, if 10 Pa pressure is acting on an area of 3 m², then the force acting on this region will be the product of pressure with the area.
![Force = Pressure * Area = 10 * 3 = 30 N.](https://tex.z-dn.net/?f=Force%20%3D%20Pressure%20%2A%20Area%20%3D%2010%20%2A%203%20%3D%2030%20N.)
Thus, the pressure acting on an area of 20 m² with force 50 N is 2.5 Nm² and the pressure acting on an area of 0.5 m² with force 50 N is 100 Nm².
The force acting on area of 3 m² with pressure 10 Pa is 30 N.
Answer:
Explanation:
We need to assume that the density of the concrete is about 2350 Kg/m^3. And using the dimensions of the highway we can calculate the volume of the highway.
![vh=4500 * 30 * 0,70\\vh=94500 m^3\\den=m/v\\m=den*v\\m=2350*94500\\\\m=222075 ton](https://tex.z-dn.net/?f=vh%3D4500%20%2A%2030%20%2A%200%2C70%5C%5Cvh%3D94500%20m%5E3%5C%5Cden%3Dm%2Fv%5C%5Cm%3Dden%2Av%5C%5Cm%3D2350%2A94500%5C%5C%5C%5Cm%3D222075%20ton)