first law of thermodynamics?
An egg is initially at rest and is dropped onto a concrete surface, resulting in its breakage. Treating the egg as a system, please address the following:
a. What is the sign of work (W)?
b. What is the sign of the change in potential energy (ΔEp)?
c. What is the change in kinetic energy (KE)?
d. What is the change in internal energy?
e. What is the sign of heat transfer?
In modeling this process, assume that sufficient time has passed for the broken egg to return to its initial temperature. What is the origin of heat transfer in this scenario?
1 Answers
a. what is the sign of W?
Negative, because work is done ON the system.
b. sign of delta Ep
If that means potential energy...then it is negative, because the system decreases in gravitational potential energy.
c. change in KE
Zero, because it began at rest and ended at rest
d. zero, because it returned to its initial temperature
e. negative, because heat is RELEASED to the environment.
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