hmwk-1-2007

# hmwk-1-2007 - PHY 317K HOMEWORK 1 DUE on by 8:00pm...

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PHY 317K August 30, 2007 HOMEWORK # 1 DUE on September 12, 2007 by 8:00pm Instructions: Use a UT ANSWER SHEET to mark answers. Provide your NAME (last, first), UTEID , and UNIQUE NUMBER of the course. Sign and date it. The answer sheets must be placed in the 317K box located by the bulletin board outside PAI 2.48. Late homework will not be graded . Answer the following 50 questions: 1. A nanosecond is: A) 10 9 s B) 10 –9 s C) 10 –10 s D) 10 –10 s E) 10 –12 2. Which of the following weighs about a pound? A) 0.05 kg B) 0.5 kg C) 5 kg D) 50 kg E) 500 kg 3. The number of significant figures in 15.0 is: A) 1 B) 2 C) 3 D) 4 E) 5 4. 1.513 + 27.3 = A) 29 B) 28.8 C) 28.9 D) 28.81 E) 28.813 Page 1

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5. A sphere with a radius of 1.7 cm has a surface area of: A) 2.1 × 10 –5 m 2 B) 9.1 × 10 –4 m 2 C) 3.6 × 10 –3 m 2 D) 0.11 m 2 E) 36 m 2 6. 1 m is equivalent to 3.281 ft. A cube with an edge of 1.5 ft has a volume of: A) 1.2 × 10 2 m 3 B) 9.6 × 10 –2 m 3 C) 10.5 m 3 D) 9.5 × 10 –2 m 3 E) 0.21 m 3 7. During a short interval of time the speed v in m/s of an automobile is given by v = at 2 + bt 3 , where the time t is in seconds. The units of a and b are respectively: A) m s 2 ; m s 4 B) s 3 /m; s 4 /m C) m/s 2 ; m/s 3 D) m/s 3 ; m/s 4 E) m/s 4 ; m/s 5 8. Suppose A = BC , where A has the dimensions L/M and C has the dimensions L/T. Then B has the dimension: A) T/M B) L 2 /TM C) TM/L 2 D) L 2 T/M E) M/L 2 T 9. Suppose A = B n C m , where A has dimensions LT, B has dimensions L 2 T –1 , and C has dimensions LT 2 . Then the exponents n and m have the values: A) 2/3; 1/3 B) 2; 3 C) 4/5; –1/5 D) 1/5; 3/5 E) 1/2; 1/2 Page 2
A) the daily rotation of the Earth B) the frequency of light emitted by Kr 86 C) the yearly revolution of the Earth about the sun D) a precision pendulum clock E) none of these 11. A particle moves along the x axis from x i to x f . Of the following values of the initial and final coordinates, which results in a negative displacement? A) x i = 4m, x f = 6m B) x i = –4m, x f = –8m C) x i = –4m, x f = 2m D) x i = –4m, x f = –2m E) x i = –4m, x f = 4m 12. A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. The average speed of the car for this 80 km trip is: A) 40 km/h B) 45 km/h C) 48 km/h D) 53 km/h E) 80 km/h 13. The coordinate of a particle in meters is given by x ( t ) = 16 t – 3.0 t 3 , where the time t is in seconds. The particle is momentarily at rest at t = A) 0.75 s B) 1.3 s C) 5.3 s D) 7.3 s E) 9.3 s 14. A ball rolls up a slope. At the end of three seconds its velocity is 20 cm/s; at the end of eight seconds its velocity is 0. What is the average acceleration from the third to the

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hmwk-1-2007 - PHY 317K HOMEWORK 1 DUE on by 8:00pm...

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