# UT PHY 317K - HW01-solutions (12 pages)

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## HW01-solutions

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- Pages:
- 12
- School:
- University of Texas at Austin
- Course:
- Phy 317k - General Physics I

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gilbert hlg574 HW01 tsoi 55730 This print out should have 28 questions Multiple choice questions may continue on the next column or page find all choices before answering 001 10 0 points The number x 0 0675 has how many significant digits Correct answer 57 1466 km h Explanation Let tother 17 min The total time is t t1 t2 t3 tother 34 8 min 11 1 min 46 3 min 17 min 1 82 h so Correct answer 3 Explanation All non zero digits are significant Any zeros in front of the first non zero digit are placeholders zeros between non zero digits are significant 1 vav 104 007 km x 57 1466 km h t 1 82 h 002 part 1 of 2 10 0 points A person travels by car from one city to another She drives for 34 8 min at 82 1 km h 11 1 min at 100 km h 46 3 min at 49 1 km h and spends 17 min along the way eating lunch and buying gas Determine the distance between the cities along this route 004 10 0 points The velocity of the transverse waves produced by an earthquake is 4 km s while that of the longitudinal waves is 7 28 km s A seismograph records the arrival of the transverse waves 51 1 s after that of the longitudinal waves How far away was the earthquake Correct answer 104 007 km Correct answer 453 668 km Explanation Explanation Let t1 v1 t2 v2 t3 v3 34 8 min 82 1 km h 11 1 min 100 km h 46 3 min and 49 1 km h x x1 x2 x3 v1 t1 v2 t2 v3 t3 82 1 km h 34 8 min 100 km h 11 1 min 49 1 km h 46 3 min 104 007 km 003 part 2 of 2 10 0 points Determine the average speed for the trip Let vt 4 km s v 7 28 km s t 51 1 s and If the distance to the earthquake is d then the time lag is d d d v vt vt v v vt t v vt d v vt 51 1 s 7 28 km s 4 km s 4 km s 7 28 km s t 453 668 km Note The longitudinal wave travels faster than the transverse waves In fact the ratio gilbert hlg574 HW01 tsoi 55730 of the longitudinal velocity to the transverse wave velocity should be about 3 9 005 part 1 of 3 10 0 points Consider the plot below describing motion along a straight line with an initial position of x0 10 m 7 5 velocity m s 7

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