Answer : Noble Gases do not readily form compounds because they are chemically stable with 8 valence electrons.
Explanation :
Noble gases are the chemical elements that are present in group 18 in the periodic table.
The elements are helium, neon, argon, krypton, xenon and radon.
They are chemically most stable except helium due to having the maximum number of 8 valence electrons can hold their outermost shell that means they have a complete octet.
They are rarely reacts with other elements to form compounds by gaining or losing electrons since they are already chemically stable.
Hence, the noble Gases do not readily form compounds because they are chemically stable with 8 valence electrons.
 
        
             
        
        
        
Answer
a) For the rock






b)  for maximum range
 for maximum range 




c) The value of θ is the same on every planet as g divides out.
 
        
             
        
        
        
Answer:
 v = -14 m/s
Explanation:
Given that,
Initial location of the ball, X₁ = 10 m
Final position of the ball,  X₂ = -25 m
Time taken to travel is, t = 2.5 s
The average velocity of the ball is given by the formula, 
                        V = X₂ - X₁ / t     m/s
Substituting the values in the above equation,
                        V = -25 - 10 / 2.5
                           = -14 m/s
The negative sign in the velocity indicates that ball rolls in the opposite direction.
Hence, the average velocity of the ball is  v = -14 m/s
 
        
             
        
        
        
Answer:
The inverse of f equals the inverse of d Subscript o Baseline plus the inverse of d Subscript I Baseline.
Explanation:
The lens equation shows the relation among focal length of the lens, image distance and object distance. It can be expressed as:
    =
 =  +
 + 
where: f is the focal length of the lens,  is the object distance to the lens and
 is the object distance to the lens and  is the image distance to the lens.
 is the image distance to the lens.
The lens equation can be used to determine the unknown value among the variables f ,  and
 and  .
.
 
        
                    
             
        
        
        
Answer:
F = 3.86 x 10⁻⁶ N
Explanation:
First, we will find the distance between the two particles:

where,
r = distance between the particles = ?
(x₁, y₁, z₁) = (2, 5, 1)
(x₂, y₂, z₂) = (3, 2, 3)
Therefore,

Now, we will calculate the magnitude of the force between the charges by using Coulomb's Law:

where,
F = magnitude of force = ?
k = Coulomb's Constant = 9 x 10⁹ Nm²/C²
q₁ = magnitude of first charge = 2 x 10⁻⁸ C
q₂ = magnitude of second charge = 3 x 10⁻⁷ C
r = distance between the charges = 3.741 m
Therefore,

<u>F = 3.86 x 10⁻⁶ N</u>