Answer:
The Surface heat flux is -9205 W/m^2
Explanation:
  Explanation is in the following attachment     
 
        
             
        
        
        
Work done by a given force is given by

here on sled two forces will do work
1. Applied force by Max
2. Frictional force due to ground
Now by force diagram of sled we can see the angle of force and displacement
work done by Max = 

 
Now similarly work done by frictional force



Now total work done on sled


 
        
             
        
        
        
If the book is placed in the middle, the forces acting on <em>p</em> and <em>q</em> is 5N. If the book is moved 50 cm from <em>q</em>, the forces at <em>p</em> and <em>q</em> can be solved by doing a moment balance
<u>With </u><u><em>p</em></u><u> as the pivot;</u>
Fq (2 m) = 10 N (0.5 m)
Fq = 2.5 N
Fp = 10 N - 2.5 N = 7.5 N
 
        
             
        
        
        
Answer: Yes
Explanation:
A ruber band can be described by his mas, M, the spring constant K, and his rest radius, wich is the radius of the circular rubber band when there is no force applied to it, so yes, a uniform thin circular rubber band of mass M and spring constant k has an original radius R
 
        
             
        
        
        
Answer:
 B) 55.8°
Explanation:
n₁ = Refractive index of liquid = 2
n₂ = Refractive index of diamond = 2.419
Here it can be seen that the light ray is in the more dense medium and approaching the less dense medium which is a case of total internal reflection.
Critical angle

∴ Critical angle is 55.8°