Answer:
The wheelbarrow's wheel and axle help the wheelbarrow to move without friction thus making it easier to push or pull. That's why it will be easier to lift a load in wheel barrow of the load is transferred towards the wheel.
 
        
                    
             
        
        
        
Answer:
Equal to 5000N
Explanation:
The stress on the material is defined by force per unit of cross-sectional area. So it depends on the force and the diameter of the wire, which is the same for both wires. The material that defines the breaking point, is also the same. Therefore, both wires have their breaking point the same at 5000N. The wire length plays no role in here.
 
        
             
        
        
        
A simple machine can make work easier by reduce the amount of energy needed to perform a task, therefore, B. <span>it magnifies the potential energy so that the kinetic energy is greater</span> is the correct answer.
        
             
        
        
        
Not that simple but there are ways. Just make sure your hands can handle it
        
                    
             
        
        
        
Answer:
Time take to fill the standing wave to the entire length of the string is 1.3 sec.
Explanation:
Given : 
The length of the one end  
  , frequency of the wave
, frequency of the wave  = 2.3 Hz, wavelength of the wave λ = 1 m.
 = 2.3 Hz, wavelength of the wave λ = 1 m.
Standing wave is the example of the transverse wave, standing wave doesn't transfer energy in a medium.
We know,
∴  λ
λ 
Where  speed of the standing wave.
 speed of the standing wave.
also, ∴ 
where  time take to fill entire length of the string.
 time take to fill entire length of the string. 
Compare above both equation,
⇒    
  sec
 sec
      
Therefore, the time taken to fill entire length 0f the string is 1.3 sec.