M = mass of the first sphere = 10 kg 
m = mass of the second sphere = 8 kg 
V = initial velocity of the first sphere before collision = 10 m/s 
v = initial velocity of the second sphere before collision = 0 m/s 
V' = final velocity of the first sphere after collision = ?
v' = final velocity of the second sphere after collision = 4 m/s 
using conservation of momentum 
M V + m v = M V' + m v'
(10) (10) + (8) (0) = (10) V' + (8) (4)
100 = (10) V' + 32
(10) V' = 68
V' = 6.8 m/s 
 
        
             
        
        
        
Answer:
A
Explanation:
The answer is A because proton number is the same as atomic number 
 
        
             
        
        
        
Answer:
80.386 degrees
Explanation:
We use the cosine equation here (which is the adjacent side of the unknown angle divided by the hypotenuse
The adjacent side = 699ft
The hypotenuse = 1034ft
using cos∅ = Adjacent/hypotenuse
where ∅ is the unknown angle
cos ∅ = 699/1034 = 0.167
∅ = arccos 0.167 = 80.368°
As easy as one can imagine
 
        
             
        
        
        
Answer:
10
Explanation: Earth takes 24 hours to complete one spin, and Mars takes 25 hours. The gas giants rotate really fast. Jupiter takes just 10 hours to complete one rotation. Saturn takes 11 hours, Uranus takes 17 hours, and Neptune takes 16 hours.