The last picture represents a pure compound
Answer:
The value is
Explanation:
From the question we are told that
The current is
The radius is
The length of the wire is \
The resistance is
The outer surface temperature is
The average thermal conductivity is
Generally the heat generated in the stainless steel wire is mathematically represented as
=>
=>
Generally the middle temperature is mathematically represented as
Because the top layer of a pool will be warmer than the bottom layer, that why filtration is important to cycle the water evenly.
Answer:
The change in internal energy for the system = - 78.87 KJ = - 79 KJ to 2 s.f
Explanation:
The first law of thermodynamics states that energy can neither be created nor destroyed but can only be transformed from one form to another.
It goes further to explain that change in the internal energy of a system (ΔU) is the sum of heat exchanged (Q) and the work done (W) by the system or on the system.
If work is done by the system, sign of work is ‘-’, if work is done on the system, the sign of work is ‘+’.
If heat is released by the system, the sign of q is ‘-’. And if heat is gained by the system, then the sign of q is ‘+’.
ΔU = Q + W
Q = 130 J
W = - 79 KJ = - 79000 J
ΔU = 130 - 79000 = - 78870 J = - 78.87 KJ = - 79 KJ