Whatever phase of the moon Ike sees, he can expect to see 
the same phase of moon again, after 29.53 days later.
        
             
        
        
        
Answer:
The average speed for the whole journey is 49.5 miles per hour. 
Explanation:
Step 1 : 
Here, both the ways, he covers the same distance.  Then, the formula to find average speed is
=  2xy / (x+y)
Step 2 :
x ----> Rate at which he travels from New York to Washington  
x  =  45
y ----> Rate at which he travels from New York to Washington  
y  =  55
Step 3 :
So, the average speed is
=  (2 ⋅ 45 ⋅ 55) / (45 + 55)
=  4950 / 100
=  49.5
 
        
             
        
        
        
It won't be able to mix because one will not get evaporated and it wont go together
        
             
        
        
        
Answer:
The angle is 18.3 degree. 
Explanation:
A uniformly charged infinite plane, density σ = 4 x 10^-9 C/cm^2, is placed vertically in air. A small ball of mass 8 g, with charge q = 10^-8 C, hangs close to the plane, so that the string is initially parallel to the plane. Take g = 9.8m/s2. When in equilibrium, by what angle is the string hanging the ball to the plane?
surface charge density, σ = 4 x 10^-5 C/m^2
Charge, q = 10^-8 C
mass, m = 0.008 kg 
Let the angle is A and the tension in the string is T. 
The electric field due to a plane is 

Now equate the forces, 
