The speed of light to be slightly less in atmosphere then in vacuum because of absorption and re-emission of light by the atmospheric molecules occurred when light travels through a material
<u>Explanation:</u>
When light passes through atmosphere, it interacts or transmits through the transparent molecules in atmosphere. In this process of transmission through atmosphere, the light will be getting absorbed by them and some will get re-emitted or refracted depending upon wavelength.
But in vacuum the absence of any kind of particles will lead to no interaction and no energy loss, thus the speed of the light will be same in vacuum while due to interactions with molecules of atmosphere, there speed will be slightly less compared to in vacuum.
 
        
             
        
        
        
Answer:
Magnitude of net force will be 432.758 N   
Explanation:
We have given x component of acceleration 
And vertical component of acceleration  
Mass of the ball m = 0.40 kg
So net acceleration 
Now according to second law of motion 
Force = mass × acceleration 
So F = 0.40×1081.896 = 432.758 N
 
        
             
        
        
        
No. The moon always keeps the same side facing us. Its rotation and revolution periods are equal.
 
        
                    
             
        
        
        
Answer:
μ = 0.375 
Explanation:
F = Applied force on the trash can = 75 N 
W = weight of the trash can = 200 N 
f = frictional force acting on trash can 
Since the trash can moves at constant speed, force equation for the motion of can is given as 
F - f = 0 
75 - f = 0 
f = 75 N 
μ = Coefficient of friction
frictional force is given as 
f = μ W
75 = μ (200)
μ = 0.375 
 
        
             
        
        
        
Answer:
0.5 m/s2
Explanation:
 accelration formula : final velocty - starting velocity divided by time