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A set of sample test questions and answers for unit vii thermodynamics. The questions cover various topics such as heat energy calculations, phase diagrams, heat transfer methods, and the laws of thermodynamics. Students are encouraged to study the equations and concepts presented in the document to prepare for exams or assess their understanding of the subject.
Typology: Exams
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Potentially useful equations:
H
in Specific heat for water = 4186 J kg−^1 C◦ −^1
Short Answers:
mwc∆T = 0.40(moilHc) so that moil =
mwc∆T
= 50 kg
mwcw∆Tw + mglcgl∆Tgl = 0
cgl = −
mwcw∆Tw mgl∆Tgl
(1.00 kg)cw(20. 42 − 20 .0) (0.050 kg)(20. 42 − 35 .0)
= 2. 4 × 103 J kg−^1 C◦ −^1
b) The process has three steps: 1. Warm the ice up to 0 ◦C, 2. Melt the ice, and 3. Warm up the water: Q = Q 1 + Q 2 + Q 3 Q = mcice∆T 1 + mLf + mcw∆T 3 giving a total energy of Q = 8. 8 × 105 J.