Answer: A method of classifying stars by their temperatures and compositions.
Explanation:
 
        
             
        
        
        
Derived quantities depend on.( fundamental)..........physical quantity
Are you from Nepal?
 
        
                    
             
        
        
        
Answer:
The time that will pass between the feeling and hearing the explosion is 2,86 secs
Explanation:
First, let's calculate the time that the wave takes to travel until the actors feel the explosion:

Now, the time that pass while the actors hear the sound is:
<em>(Remember that the sound speed in the air is 340 m/s on average)</em>

So, the time between the feeling and hearing is 3,23 - 0,37 = 2,86 secs
 
        
             
        
        
        
Answer:
ok I think sooo
Explanation:
Velocity and displacement
 
        
             
        
        
        
Use the conservation of angular momentum; angular momentum at the beginning = angular momentum at the end 
Conservation of angular momentum: 
I1 w1 = I2 w2 
Where I is the moment of inertia. For a sphere, I=2/5 m R^2. Substituting into the equation above we get 
w2 = I1 w1 / I2 = w1 m1 R1^2 / (m2 R2^2) 
w2 = w1 4 * (R1/R2)^2
= 4*(1)*(7E5/7.5)^2
= 3.48E10 revs/(17days)
= 2.04705882 x 10^9 revs/sec