Answer: The correct answer for this question is letter (B) The electromagnetic waves reach Earth, while the mechanical waves do not. The sun generates both mechanical and electromagnetic waves. Space, between the sun and the earth is a nearly vacuum. So mechanical wave can not spread out in the vacuum.
Hope this helps!
 
        
             
        
        
        
It takes about 27.32 days
        
                    
             
        
        
        
Answer:v=41.23 m/s 
Explanation:
Given
mass of heavy object 
distance of  from the axle
 from the axle 
mass of rock 
Length of rod 
distance of  from axle
 from axle 
Net torque acting is




Work done by  is converted to rock kinetic Energy
 is converted to rock kinetic Energy
thus

Where 





 
        
             
        
        
        
Answer:
Initial velocity, U = 28.73m/s 
Explanation:
Given the following data;
Final velocity, V = 35m/s
Acceleration, a = 5m/s²
Distance, S = 40m
To find the initial velocity (U), we would use the third equation of motion. 
V² = U² + 2aS
Where;
V represents the final velocity measured in meter per seconds. 
U represents the initial velocity measured in meter per seconds. 
a represents acceleration measured in meters per seconds square. 
S represents the displacement measured in meters.
Substituting into the equation, we have;
35² = U + 2*5*40
1225 = U² + 400
U² = 1225 - 400
U² = 825
Taking the square root of both sides, we have;
Initial velocity, U = 28.73m/s