It can solidify, it depends on the tempeture.
The resistance between A and B is 10 ohms.
Answer:
0.02
Explanation:
coefficient of kinetic friction = μ
force of friction = Ff
Normal Force = FN, but
FN = -W
Ff = -μFN
so μ = Ff/FN
= 4N/200N
= 0.02.
Power = 
Delilah: 170J/30s = 5.66 W
Adam: 260J/20s = 13 W