D. Nucleus because it is not a part of the group.
Because, body at higher temperature has higher average KE of molecules and body at lower temperature has lower average KE of molecules. When two bodies having higher temperature and lower temperature are keep in contact, the body at higher temperature shares their energy to molecules at lower temperature.
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Answer:F=400.28 N
Explanation:
Given
mass of large cube 
mass of small cube 
coefficient of static friction 
acceleration a of the system is given by
Now Normal reaction between two blocks is given by
friction tries to balance weight
thus 
and 
We know, density = Mass / Volume
It represents density is directly proportional to mass and indirectly proportional to volume. So, at a constant volume, object with larger density will appear more heavier than that of object with smaller density.
In short, Heavier object will have the higher density than the other.
Hope this helps!
