amount of work done is 5880 J
Given:
mass of object = 50kg 
Final height = 20m
initial height = 8m 
To Find:
amount of work done
Solution:
work is done when a force acts upon an object to cause a displacement. You can calculate the energy transferred, or work done, by multiplying the force by the distance moved in the direction of the force.
The work done by gravity is given by the formula,
W = mgh
W = 50 x 9.8 x ( 20-8)
 = 5880 J
So the work done is 5880 J
Learn more about Work done here:
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Answer:
0.76
Explanation:
we are given:
radius (r) =5.7 m
speed (s) = 1 revolution in 5.5 seconds
acceleration due to gravity (g) = 9.8 m/s^{2}
coefficient of friction (Uk) = ?
  we can get the minimum coefficient of friction from the equation below
centrifugal force = frictional force
m x r x ω^{2} = Uk x m x g
r x ω^{2} = Uk x g
Uk = 
where ω (angular velocity) = 
=  = 1.14
 = 1.14
Uk =  = 0.76
 = 0.76
 
        
             
        
        
        
plasma is a superheated liquid
So, a would-be the correct option. 
 
        
             
        
        
        
Answer:
folk dancing is old music and ball room is young dancing
 
        
             
        
        
        
<span>A "White" colored light must be shown by a 14-foot boat that is operating under oars after it is dark, in order to prevent a collision.
Boats which are less than 23 feet cannot exceed a maximum speed of 7 knots. They need to exhibit an all-around white light when it is sailing in the dark.
The other practicable sidelights can also be used instead of the white lights, when they are sailing in international waters.
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