The stretch of the spring is

The constant of the spring is k=15 N/m, so we can find the force produced by the weight by using Hook's law:
 
 
        
        
        
Answer:
45.93°
Explanation:
The angle of incidence is given as 32.7°
The refractive index of the water that is 
Refractive index of the air that is  (because the refractive index of air is 1 )
 (because the refractive index of air is 1 )
We have to find the angle at which the light leave the water means angle of refraction 
So according to snell's law 


r =45.93°
So the light leave the water at an angle of 45.93°
 
        
             
        
        
        
The answer would be A because as you get further away from sound the intensity decreases. 
        
             
        
        
        
Answer:
 T/√8 
Explanation:
From Kepler's law, T² ∝ R³ where T = period of planet and R = radius of planet.
For planet A, period = T and radius = 2R.
For planet B, period = T' and radius = R.
So, T²/R³ = k
So, T²/(2R)³ = T'²/R³
T'² = T²R³/(2R)³ 
T'² = T²/8
T' = T/√8 
So, the number of hours it takes Planet B to complete one revolution around the star is T/√8 
 
        
             
        
        
        
Answer:
Explanation:
Given
acceleration is given by

where 

Also acceleration is given by 








at 





when air drag is neglected maximum height reached is


