Valence electrons are required for certain bonding processes. Without them you cannot bond with certain elements. For example, carbon bonds really well with carbon because it has the same amount of valence electrons. However carbon would not bond well with uranium due to the massive differences in valence electrons. Hope this helps!
Answer:
v = 66.4 m/s
Explanation:
As we know that plane is moving initially at speed of
![v = 70 m/s](https://tex.z-dn.net/?f=v%20%3D%2070%20m%2Fs)
now we have
![v_x = 70 cos25](https://tex.z-dn.net/?f=v_x%20%3D%2070%20cos25)
![v_x = 63.44 m/s](https://tex.z-dn.net/?f=v_x%20%3D%2063.44%20m%2Fs)
![v_y = 70 sin25](https://tex.z-dn.net/?f=v_y%20%3D%2070%20sin25)
![v_y = 29.6 m/s](https://tex.z-dn.net/?f=v_y%20%3D%2029.6%20m%2Fs)
now in Y direction we can use kinematics
![v_y = v_i + at](https://tex.z-dn.net/?f=v_y%20%3D%20v_i%20%2B%20at)
![v_y = 29.6 - (9.81 \times 5)](https://tex.z-dn.net/?f=v_y%20%3D%2029.6%20-%20%289.81%20%5Ctimes%205%29)
![v_y = -19.5 m/s](https://tex.z-dn.net/?f=v_y%20%3D%20-19.5%20m%2Fs)
since there is no acceleration in x direction so here in x direction velocity remains the same
so we will have
![v = \sqrt{v_x^2 + v_y^2}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7Bv_x%5E2%20%2B%20v_y%5E2%7D)
![v = \sqrt{63.44^2 + 19.5^2}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B63.44%5E2%20%2B%2019.5%5E2%7D)
![v = 66.4 m/s](https://tex.z-dn.net/?f=v%20%3D%2066.4%20m%2Fs)
For a certain interval of time, an object is acted on by a constant non-zero force. For this interval of time . . . . .
A. The object is at rest. No. From F=ma, if F is not zero, the object can't remain at rest.
<em>B.</em> <em>The object's velocity changes.</em> <em>Yes.</em> From F=ma, if F is not zero, there must be acceleration.
C. The object's velocity can only increase. No. It might decrease.
D. The object is moving with constant velocity. No. From F=ma, if F is not zero, there must be acceleration.
<em>E.</em> <em>The object is accelerating.</em> <em>Yes.</em> From F=ma, if F is not zero, there must be acceleration.