Answer:
5.4 ms⁻¹
Explanation:
Here we have to use conservation of energy. Initially when the stick is held vertical, its center of mass is at some height above the ground, hence the stick has some gravitational potential energy. As the stick is allowed to fall, its rotates about one. gravitational potential energy of the stick gets converted into rotational kinetic energy.
 = length of the meter stick = 1 m
 = length of the meter stick = 1 m 
 = mass of the meter stick
 = mass of the meter stick
 = angular speed of the meter stick as it hits the floor
 = angular speed of the meter stick as it hits the floor
 = speed of the other end of the stick
 = speed of the other end of the stick
we know that, linear speed and angular speed are related as 

 = height of center of mass of meter stick above the floor =
 = height of center of mass of meter stick above the floor = 
 = Moment of inertia of the stick about one end
 = Moment of inertia of the stick about one end
For a stick, momentof inertia about one end has the formula as 

Using conservation of energy 
Rotational kinetic energy of the stick = gravitational potential energy 

 
        
             
        
        
        
Answer: 
Explanation:
The diffraction angles  when we have a slit divided into
 when we have a slit divided into  parts are obtained by the following equation:
 parts are obtained by the following equation:
 (1)
 (1)
Where:
 is the width of the slit
 is the width of the slit
 is the wavelength of the light
 is the wavelength of the light  
 is an integer different from zero.
 is an integer different from zero.
Now, the second-order diffraction angle is given when  , hence equation (1) becomes:
, hence equation (1) becomes:
 (2)
 (2)
Now we have to find the value of  :
:
 (3)
 (3)
Then:
 (4)
   (4)
 (5)
   (5)
Finally:
 (6)
   (6)
 
        
             
        
        
        
It is the branch of science, in which we study different phenomena of atmosphere including climate and weather.
        
                    
             
        
        
        
Well sorry but this is the wrong language.
        
                    
             
        
        
        
Answer:
0.853 m/s
Explanation:
Total energy stored in the spring = Total kinetic energy of the masses.
1/2ke² = 1/2m'v².................... Equation 1
Where k = spring constant of the spring, e = extension, m' = total mass, v = speed of the masses.
make v the subject of the equation,
v = e[√(k/m')].................... Equation 2
Given: e = 39 cm = 0.39 m, m' = 0.4+0.4 = 0.8 kg, k = 1.75 N/cm = 175 N/m.
Substitute into equation 2
v = 0.39[√(1.75/0.8)
v = 0.39[2.1875]
v = 0.853 m/s
Hence the speed of each mass = 0.853 m/s