C is the best answer
hope it helped
        
                    
             
        
        
        
<span>If there isn't any force then the normal contact force will be 
N=m*g=7.5*9.81=73.58N 
which is 73.58-23=50.58N less 
so, there the person must pull at 23 degree upward 
break down the tension in two components, vertical and horizontal. 
vertical tension= 50.58=T*sin23 
T=50.58/sin23=129.45N</span>
        
                    
             
        
        
        
Answer: C solar energy
Solar energy has the greatest  impact on primary productivity.
Explanation:
Primary productivity  is the amount of organic compounds synthesized from carbon dioxide. Primary production occurs by the process of photosynthesis. Since the process of photosynthesis uses sunlight as the energy source solar energy has the greatest impact on primary productivity.
The synthesis can occur in atmosphere as well as aquatic environment. The organisms that perform the function of primary production are called producers .In terrestrial regions plants are the producers and in aquatic systems algae are the  primary producers.
 
        
             
        
        
        
 Answer:
a. A = 0.1656 m 
b. % E = 1.219 
Explanation:
Given 
mB = 4.0 kg , mb = 50.0 g = 0.05 kg , u₁ = 150  m/s , k = 500 N / m
a.
To find the amplitude of the resulting SHM using conserver energy 
ΔKe + ΔUg + ΔUs = 0 
¹/₂ * m * v²  -  ¹/₂ * k * A² = 0
A = √ mB * vₓ² / k 
vₓ = mb * u₁ / mb + mB 
vₓ = 0.05 kg * 150 m / s / [0.050 + 4.0 ] kg = 1.8518
A = √ 4.0 kg * (1.852 m/s)²   /   (500 N / m)
A = 0.1656 m 
b.
The percentage of kinetic energy 
%E = Es / Ek
Es = ¹/₂ * k * A² = 500 N / m * 0.1656²m = 13.72 N*0.5
Ek = ¹/₂ * mb * v² = 0.05 kg * 150² m/s = 1125 N 
% E = 13.72 / 1125 = 0.01219 *100
% E = 1.219 
 
        
             
        
        
        
Answer:Fg = mg however newtons second law states that the net force acting on an object is equal to it's mass times it's acceleration so what allows us to say that Fg = mg because certainly not for every single situation the net force is going to equal to the force of gravity please explain... what allows us to say Fg = mg
Source https://www.physicsforums.com/threads/fg-mg-questioned.336776/
Explanation: