Answer:
one billion to ten billion joules.
Explanation:
To keep a 100-watt light bulb going for one second, one hundred joules of energy will be used.
 
        
                    
             
        
        
        
Answer:  A) 
Explanation:
The equation for the moment of inertia  of a sphere is:
 of a sphere is:
 (1)
 (1)
Where:
  is the moment of inertia of the planet (assumed with the shape of a sphere)
 is the moment of inertia of the planet (assumed with the shape of a sphere)
 is the mass of the planet
 is the mass of the planet
 is the radius of the planet
 is the radius of the planet
Isolating   from (1):
 from (1):
  (2)
 (2)
Solving:
  (3)
 (3)
Finally:
  
 
Therefore, the correct option is A.
 
        
             
        
        
        
Answer:

Explanation:
<h3><u>Given data:</u></h3>
Frequency = f = 200 Hz
Velocity = v = 400 m/s
<h3><u>Required:</u></h3>
Wavelength = λ = ?
<h3><u>Formula:</u></h3>
v = fλ
<h3><u>Solution:</u></h3>
Put the givens in the formula
400 = (200)λ
Divide 200 to both sides
400/200 = λ
2 m = λ
λ = 2 m
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
 
        
             
        
        
        
It is known as silicon dioxide or silica!
Hope this helps!