18) Which combination of statements is most accurate? [Enter
your answer as a string of the letter options you believe are
correct. For instance, if you think options A, D, and E are
correct, then enter "ADE". NOTE: There are only 5 tries for this
problem.]
A) The random jiggling of atoms in a material is an example of
source energy.
B) Source energy can never be purely converted into mechanical
energy.
C) Macroscopic processes that change source energy always increase
thermal energy as well.
D) Mechanical energy can be converted back into source energy, with
a corresponding increase in thermal energy.
E) None of the above
(A) True ,
Source energy is provided by the random motion of the atoms.
As we calcualte kinetic energy also due to random motion of
molecule.
(B) True,
We can not convert complete source energy into mechanical energy
because some energy
will also increase in thermal due to friction available and other
realistic parameters.
(C) False,
It is not necessary that always energy can be seen as thermal
energy , it can be available in other form also.
(D) True,
When we try to convert mechanical energy back into source energy
thermal energy can increase.
therefore correct options should be
ABD.
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