The moon has approximately 1/4 of earths diameter, 1/50 of earths volume and 1/80 of earths mass
        
                    
             
        
        
        
Answer
Given,
Energy absorbed, 
Energy expels,
Temperature of cold reservoir, T = 27°C
a) Efficiency of engine
  
  

b) Work done by the engine
  
  
  
c) Power output 
      t = 0.296 s
    
    
    
 
        
             
        
        
        
Answer:
2.5 m/s
Explanation:
Mechanical energy is the sum of the potential and kinetic energy.
E = PE + KE
E = mgh + ½mv²
172.1 J = (7.26 kg) (9.8 m/s²) (2.1 m) + ½ (7.26 kg) v²
v = 2.5 m/s
 
        
                    
             
        
        
        
If a Substance conducts heat easily then it is considered a good conductor, since the electrons can move freely within the substance.
        
                    
             
        
        
        
Answer:
a
The height is   
b 
The horizontal distance is  
 
Explanation:
From the question we are told that 
   The speed is  
   The angle is  
    The height of the cannon from the ground is  h  =  2 m 
   The distance of the net from the ground is k  =  1 m 
   
Generally the maximum height she reaches is mathematically represented as  
      
=>    ![H  =  \frac{(15)^2 [sin (40)]^2 }{2 * 9.8}  +  2](https://tex.z-dn.net/?f=H%20%20%3D%20%20%5Cfrac%7B%2815%29%5E2%20%5Bsin%20%2840%29%5D%5E2%20%7D%7B2%20%2A%209.8%7D%20%20%2B%20%202)
=>    
Generally from kinematic equation  
     
Here s is the displacement which is mathematically represented as 
          s  =  [-(h-k)]  
     =>  s =  -(2-1)
     =>  s  = -1 m 
There reason why s =  -1 m is because upward motion canceled the downward motion remaining only the distance of the net from the ground which was covered during the first half but not covered during the second half 
      a =  -g = -9.8
     
So 
     
=>  
using  quadratic formula to solve the equation we have 
     
Generally distance covered along the horizontal is  
    
=>   
=>   