I did the experiment. (dipping wins)


 - H2O ice bath  
 - canning jar  
 - thermometer 
 - pot of boiling water
 - stop watch

There were four trials, each lasting 10 minutes.  Boiling water was poured into the canning jar, and the spoon was taken from the ice bath and placed into the jar.  A temperature reading was taken once a minute.  After each trial the water was poured back into the boiling pot and the spoon was placed back into the ice bath.
![equipment][1]

----------------------------------------
     Method:                  Final Temp.
     1. No Spoon              151 F 
     2. Spoon in, no motion   149 F
     3. Spoon stirring        147 F
     4. Spoon dipping         143 F

Temperature Readings have an error +-1 F, 

   
------------
    Data:

    No Spoon       
    
    Min Temp (F)
    0   182
    1   180
    2   174
    3   171
    4   168
    5   164
    6   161
    7   158
    8   155
    9   153
    10  151

    Spoon, no stir, no dip       
    
    Min Temp (F)
    0   180
    1   175
    2   172
    3   168
    4   165
    5   162
    6   160
    7   156
    8   153
    9   151
    10  149

    Stirring
    
    Min Temp (F)
    0   180
    1   175
    2   171
    3   167
    4   164
    5   161
    6   158
    7   155
    8   152
    9   150
    10  147

    Dipping
    
    Min Temp (F)
    0   180
    1   177
    2   173
    3   168
    4   164
    5   160
    6   156
    7   152
    8   149
    9   146
    10  143


  [1]: https://i.sstatic.net/zPIDz.jpg