Answer: v= 195.2 m/s
Explanation:
The centripetal acceleration acts on the bottom of the test tube trying to take it closer to the axis of rotation, and it is defined by the following expression:
ac = v² / r
We know that ac = 5.4. 10⁴ . g = 5.4.10⁴.9.8 m/s²
Expressing r in m ⇒ r = 0.072 m.
So, the only unknown that remains is v, which is the linear speed of the bottom of the test tube, which we want to find out:
v = √ac. r = √5.4.10⁴.9.8 m/s². 0.072 m = 195.2 m/s
Answer:
Option B and C
Explanation:
The United states of America developed Atomic weapons to threat the Nazis in Germany as there was rumor that they are also developing such kind of weapon.
However, after the World war II, the US continued to develop atomic weapons to look powerful among all.
In past they had dropped atom bombs two times on Japan as they wanted to defeat Japanese speedily.
The load is placed at distance 0.4 L from the end of
area.
<h3>What is meant by torque?</h3>
The force that can cause an object to rotate along an axis is measured as torque. Similar to how force accelerates an item in linear kinematics, torque accelerates an object in an angular direction. A vector quantity is torque.
Let the beam is of length L
Now the stress on both the end is the same now we can say that torque on the beam due to two forces must be zero
![$N_1 * x=N_2 *(L-x)$](https://tex.z-dn.net/?f=%24N_1%20%2A%20x%3DN_2%20%2A%28L-x%29%24)
also, we know that stress at both ends are same
![$\frac{N_1}{12}=\frac{N_2}{8}$](https://tex.z-dn.net/?f=%24%5Cfrac%7BN_1%7D%7B12%7D%3D%5Cfrac%7BN_2%7D%7B8%7D%24)
![$2 * N_1=3 * N_2$](https://tex.z-dn.net/?f=%242%20%2A%20N_1%3D3%20%2A%20N_2%24)
Now from two equations we have
![$\frac{3}{2} N_2 * x=N_2 *(L-x)](https://tex.z-dn.net/?f=%24%5Cfrac%7B3%7D%7B2%7D%20N_2%20%2A%20x%3DN_2%20%2A%28L-x%29)
solving the above equation we have
![$x=\frac{2}{5} L](https://tex.z-dn.net/?f=%24x%3D%5Cfrac%7B2%7D%7B5%7D%20L)
so the load is placed at distance 0.4 L from the end of
area.
The complete question is:
47. the beam is supported by two rods ab and cd that have cross-sectional areas of
and
, respectively. determine the position d of the 6-kn load so that the average normal stress in each rod is the same.
To learn more about torque refer to:
brainly.com/question/20691242
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