Answer:
F_g = 372.78 N
Explanation:
Formula for force of gravity is;
F_g = mg
Where;
m is mass
g is acceleration due to gravity 
We are given;
Mass = 38 kg
Acceleration due to gravity has a constant value of 9.81 m/s²
Thus;
F_g = 38 × 9.81
F_g = 372.78 N
 
        
             
        
        
        
Answer:
  w = 2w₀     the angular velocity of man doubles
Explanation:
In this exercise, releasing the weights reduces the moment of inertia
        I= I₀ / 2
Therefore, since the platform system plus man is isolated, the kinetic moment must be conserved
          L₀ = L
        I₀ w₀ = I w
        I₀ w₀ = I₀ / 2 w
        w = 2w₀
therefore the angular velocity of man doubles
 
        
             
        
        
        
Explanation:
a) Density is the amount of mass in a specific amount of volume
b) Some substances are less dense than water so will float and vice versa 
c) The wooden plank has less density than water due to having larger volume and vice versa with the wooden block since volume and density are inversely proportional
II) (a) They are all metals 
(b) water -> Compound 
oxygen -> Element 
Gold-> Element 
Salt-> Compound 
 
        
                    
             
        
        
        
Answer:
An object changes position if it moves relative to a reference point. The change in position is determined by the distance and direction of an object's change in position from the starting point (displacement). Direction • Direction is the line, or path along which something is moving, pointing, or aiming.
Explanation: