Exam (elaborations)
PHY1506 EXAM PACK 2023
- Institution
- University Of South Africa (Unisa)
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PHY1506 EXAM PACK 2023QUESTIONS
AND ANSWERS
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,PHY1506
EXAM PACK
Revision PACK
Questions. Answers
,INSTRUCTIONS:
• This paper consists of 5 pages.
• The paper consists of 6 questions for a total of 100 marks.
• Marks for each question or part are indicated in brackets on the right of the question.
• Show all the necessary steps in carrying out your calculations.
• The information given on page 4 maybe used without proof.
• Answer ALL questions.
[TURN OVER]
, PHY1506
May/June 2017
Question 1
4 3
The figure below represents a pV [p in Pa and
× 10
V in m] diagram for 7.50 moles of an ideal diatomic
gas taken through the cycle a → b → c.
(a) Calculate the highest temperature reached by the gas during the cycle (4)
(b) What net work does the gas do during the cycle? (4)
(c) How much heat is exchanged with the gas during part bc of the cycle? Does it enter or
leave the gas? (4)
(d) What is the change in the internal (thermal) energy of the gas during part bc of the(4)
cycle?
(e) What is the change in the internal (thermal) energy of the gas during the entire cycle?
(4)
[20]
Question 2
(a) The figure below shows three electric charges labeled
1,Q2,Q3Q
, and some electric field lines in the
region surrounding the charges.
What are the signs of the three charges? (6)
[TURN OVER]
Page 2 of 5
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