Answer:
The work done by the frictional force is 600J.
Explanation:
The work  done by the frictional force is
 done by the frictional force is
 .
.
Now,  and
 and  ; therefore,
; therefore,


Hence, the work done by friction is 660J. 
 
        
             
        
        
        
Answer:
Radius, 
Explanation:
It is given that,
Magnetic field, B = 0.275 T
Kinetic energy of the electron, 
Kinetic energy is given by :


 
            
v = 1037749.04 m/s
The centripetal force is balanced by the magnetic force as :




So, the radius of the circular path is  . Hence, this is the required solution.
. Hence, this is the required solution.
 
        
                    
             
        
        
        
Answer:
protein
Explanation:
protein is a very large complex macro-molecule that requires amino acids
 
        
             
        
        
        
Answer:
13 blocks 
Explanation:
The total distance the student travels is 13 blocks. 
  Distance is the length of path covered during the motion of a body. 
  To find distance: 
  Total distance  = Number of blocks to the west + number of blocks to the north + number of blocks to the east
  Total distance  = 3blocks + 4blocks + 6blocks  = 13blocks