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UNIVERSITY OF SOUTH AUSTRALIA School of Electrical & Information Engineering (Applied Physics) ENGINEERING PHYSICS Exam Time: 30 minutes Name …................................................................... …

Marks: 30 Student Number………………………………………………

QUESTIONS ( 9 MARKS )

1. question about 1d motion 2. 2d motion projectile? 3. question about Newton’s laws 4. circular motion 5. work 6. energy 7. momentum 8. collisions and conservation of energy and momentum 9. rotation 10. relativity 11. quantum mechanics (Heisenberg different forms of law…which is incorrect?) 12. atomic to molecular 13. nuclear 14. radiation .

ANSWERS

SHORT ANSWER QUESTIONS 12 MARKS ) Question 1 (4 marks) Discuss the motion of a projectile….. (Car in cannon cartoon….if possible) ………………………………………..…………………………………………………………………………… Question 2 (4 marks) Describe Newtons laws of motion and how they apply to a child’s swing. ………………………………………..…………………………………………………………………………… Question 3 (4 marks) spinning top.. Describe it’s motion in terms of angular velocity acceleration etc and why does it slow down… OR Cd player…. why does it change speed on different tracks…. talk about velocity versus angular velocity distance from center of mass etc.. ………………………………………..…………………………………………………………………………… Question 4 (4 marks) Work…in lifting something and moving it elsewhere… how does a long arm help in turning nuts on car wheel… does it reduce the amount of work required?? ………………………………………..…………………………………………………………………………… Question 4 (4 marks) Radiation or nuclear question ………………………………………..…………………………………………………………………………… Question 4 (4 marks) spectroscopy question…. difference between emission and absorption spectra and why?? or emission of x-rays.. ………………………………………..…………………………………………………………………………… PROBLEMS 12 MARKS ) Problem 1 (4 marks) 1d-2d motion The record for the ski jump is 180 m set in 1989. Assume the jumper comes off of the end of the ski jump horizontally and falls 90 m vertically before contacting the snow. What was the initial horizontal speed of the jumper? a) 18.4 ms-1, b) 4.28 ms-1, c) 42 ms-1 or d) 84 ms-1 Show all of your calculation and draw a diagram to illustrate this situation. If a crate of cargo is released from an aircraft during horizontal flight and its parachute does not open, how high was the aircraft flying if the cargo crate hits the ground 16 seconds after it was released? Show all of your calculation and draw a diagram to illustrate this situation. ……………………………………………………………………………………… Problem 2 (4 marks) Satellite or centripetal motion question (or terminal velocity) …………………………………………………………………………………… Problem 3 (4 marks) Inertia question or rotational motion question or torue… pulley question should be good since example done in two ways. ……………………………………………………………………………………… Problem 4 (4 marks) conservation of energy and momentum ……………………………………………………………………………………… Problem 5 (4 marks) half-life question

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Problem 6 (4 marks) error propagation…… if m +/- 0.5g and v is +/- 0.1m/s what is error in momentum and in kinetic energy…? ……………………………………………………………………………………… Problem 7 (4 marks) bungee baby….. spring constant and newtons laws/.. ………………………………………………………………………………………