Answer;
B. Without good stability, athletes are too clumsy to perform well.
Explanation;
Stability refers to the resistance to both linear and angular acceleration, or resistance to disruption of equilibrium.
Developing and enhancing core strength and stability helps athletes to maximize their power output and enhance game day performance. Additionally, Improving core strength and stability can also help athletes reduce their risk of injury.
I believe that the answer is A
The answer is E. Short and thick while cold.
Answer:
a) ![P=2450\ Pa](https://tex.z-dn.net/?f=P%3D2450%5C%20Pa)
b) ![\delta h=23.162\ cm](https://tex.z-dn.net/?f=%5Cdelta%20h%3D23.162%5C%20cm)
Explanation:
Given:
height of water in one arm of the u-tube, ![h_w=25\ cm=0.25\ m](https://tex.z-dn.net/?f=h_w%3D25%5C%20cm%3D0.25%5C%20m)
a)
Gauge pressure at the water-mercury interface,:
![P=\rho_w.g.h_w](https://tex.z-dn.net/?f=P%3D%5Crho_w.g.h_w)
we've the density of the water ![=1000\ kg.m^{-3}](https://tex.z-dn.net/?f=%3D1000%5C%20kg.m%5E%7B-3%7D)
![P=1000\times 9.8\times 0.25](https://tex.z-dn.net/?f=P%3D1000%5Ctimes%209.8%5Ctimes%200.25)
![P=2450\ Pa](https://tex.z-dn.net/?f=P%3D2450%5C%20Pa)
b)
Now the same pressure is balanced by the mercury column in the other arm of the tube:
![\rho_w.g.h_w=\rho_m.g.h_m](https://tex.z-dn.net/?f=%5Crho_w.g.h_w%3D%5Crho_m.g.h_m)
![1000\times 9.8\times 0.25=13600\times 9.8\times h_m](https://tex.z-dn.net/?f=1000%5Ctimes%209.8%5Ctimes%200.25%3D13600%5Ctimes%209.8%5Ctimes%20h_m)
![h_m=0.01838\ m=1.838\ cm](https://tex.z-dn.net/?f=h_m%3D0.01838%5C%20m%3D1.838%5C%20cm)
<u>Now the difference in the column is :</u>
![\delta h=h_w-h_m](https://tex.z-dn.net/?f=%5Cdelta%20h%3Dh_w-h_m)
![\delta h=25-1.838](https://tex.z-dn.net/?f=%5Cdelta%20h%3D25-1.838)
![\delta h=23.162\ cm](https://tex.z-dn.net/?f=%5Cdelta%20h%3D23.162%5C%20cm)