phys200_sample_midterm_solution

phys200_sample_midterm_solution - Sample M ioléerm g...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Sample M ioléerm g olufiion Part I: Multiple-choice questions (40 marks) This part consists of 8 multiple-choice questions. Please read each question carefully and circle the correct answer. Each correctly answered question is worth 5 marks. No partial credit is given for this part of the exam. 1. A car travels the first 100 m with a speed of 10.0 m/s. It then travels the next 100 m with a speed of 20.0 m/s. What is its average speed? 7’laléinm is 13.3m/s 0 l 0 b 15.0m/s t = '00“ + 0 m = lé-O 5 c. 16.7 m/s 10.0 m/s 2 0 - 0 n /s (1. 17mm _ e. 18.0m/s $ 0 = =1 ’3'? “7/5 -0 2. A freely falling body has an acceleration of 9.8 m/s2 downward. This means that: a. the body falls 9.8 meters during each second b. the body falls 9.8 meters during the first second only @ the speed of the body increases by 9.8 rn/s durin each second d. the acceleration of the body increases by 9.8 oils in each second e. the acceleration of the body decreases by 9.8 m/s2 in each second 3. Two forces are acting on an object as shown. 80 N 120 N What is the magnitude of the resultant force? a. 40N 9?, = 120 625 60"-— 30 405%" b. 47.5N = 3q_ 20”, ® 185N d_ 193N [9,: ISLE/V e. 200N -—> {2 =m 4. A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown? a. 2.7m/s Time 0! 1411/ from verhha/ mofi'ang Sim/S o=Z4m+0+%C—qvgn/$2)i? c. 13mfs d. l9m/s ___ -_-. 223 s e. 23m/s fi> é Ham barf-Zon'f'al moh'o": y: lam ngm/s ° 2-2133 6. A chair of mass 5.00 kg, sitting on a rough horizontal surface, requires a force of 32.0 N applied in a horizontal direction to cause it to slide at constant speed. If a person of mass 65.0 kg sits in the chair; what horizontal force is now required to slide the person and chair at constant speed? APP/[dd 760”: f5 Equal to LII/75 (0’6: 0'; a. 32.0N _ b. 49.0N kinetic Inté'on fr) both sifmfions. so, 223% 32”: 120‘: Cs-aa/<a)C0|-So ms“) ‘3- 536N F = We (70.00k3) (Guam/51) You are standing on a weight scale in an elevator. 0f the following, the scale shows the highest reading when the elevator: moves upward with constant speed moves upward with decreasing speed moves downward with increasing speed moves downward with constant speed moves downward with decreasing speed 09-9 9‘s» Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit? /5'_"’7 U I" V Sdays A __i._—/::.2 7’ a. : 4 b. 20days 93' 6M A 80days T 160days e. 320days IQ:(2'3‘rB/Vé) :(fg)(fi):4x2=$ '7; am a, la) ’2: 9/4 A car goes around a flat curve of radius 50 m at a speed of 14 m/s without slipping. Which of the following statements, regarding friction between the tires and the road, is correct? M v1 @ coefficient of static friction is 0.40 or greater Mg m 00 >/ ——-— b. coefficient of static friction is 0.40 or smaller (3 c. coefficient of kinetic fiction is 0.40 or greater 2 d. coefficient of kinetic friction is 0.40 or smaller 3> (/15 > 1— e. The road is frictionless / [Q g Part II: Problems (60 marks) This part consists of 4 problems that require detailed solutions. Show all your work, including neat and clearly labelled diagrams. Each problem is worth 15 marks. Partial credit will given for partially correct solution steps. 9. The engineer of a passenger train traveling at 25.0 m/s sights a freight train whose caboose is 200 m ahead on the same track The freight train is traveling at 15.0 mfs in the same direction as the passenger train. The engineer of the passenger train immediately applies the brakes, causing a constant deceleration of 0.200 Iii/52, while the freight train continues with constant speed. (3.) Where will the two trains collide? (b) What is the speed of the passenger train just before the collision? a) fist/rm: £17547} *he Cal/1's/bn af- [I happpns 1| paslib'ob train. . 75m We W I o + (25~omls) t + q— _ z t1 2 (—02.0070/5 3 x :2 200m + CI5.om/S) t + 0 4t '83 30/014915"? 71/15 744/0 aqua/92205 abmre, W5 05+ o.ié2_ 107i +200=° /___———————- g If- )0: Clb)°‘_4(o-l)(2c=a) 9 r. 2Xo-l We select £106 Snow/Icy fil’mc, t : 27. 6 9 b ) UP; =<Z5m/$)‘1"C-—O-200m/53 = )(27-69) '5 "Vs 10. A plane flying hofizontally, at a speed of 50.0 m/s and at an elevation of 160 m, drops a package. Two seconds later it drops a second package. (a) How far apart will the two packages land on the ground? (b) What is the velocity of each package when it hits the ground? <-—7‘—"* 0L) since the if; harl'chnr‘a! \ \ \\\ v'e/ocl'lg of éhc A \\ \33‘ Package is cons¥anf \\ \\ and equal J)»: \ \ P/ane's Speed, A “wen we mica, <—-—7t--* x = (50.0 m/5)(2.oo s) = [/00 m} b) 7170”: vac Verfr'c'a/ mofit'on, we have, @623 o +2C‘q-80W/S’)(o—I60M) —‘-> 7/; =—56-0 m/s 9": 306/? Package 11,45 Hat: ground wf-I-h a. speed 50 = W -- 75-l MIS 56 ml an angle & 1 l. A block of mass 1.3 kg is projected upwards along an inclined plane with an initial speed of 5.0 MS. The angle of inclination of the inclined plane to the horizontal is 25°. The coefficients of static and dynamic friction between the block and the inclined plane are 0.58 and 0.52, respectively. (3.) Calculate the deceleration of the 5.0 m/s block while moving up the plane. (b) When the block stops at its maximum height, is it going to slide down again? Explaine. a) ,. 7716. Ad farce fleeing On #he block is dint, £60] down the incline and has a magm'lu/e. F: mg sing? + [ALA mg 6055’ *So, the date/cradion /'5 equal £0 F- az—yfi" =‘ QCSI'nQ—f-Mt 605(9) 2? w W/ygn the. bIDC/k Sic/>5 a1! #5 m’x;m"m hct'ght/ eke force of grayfib gag-n3 on ,4 down the incline 1's e ml :50: 3 7 ’2 While £103 mahmum fang o-/ SMHC. (’H'C‘Hon 1's 1;, = MAS mg C959 .2 6.?0A/ ’30, Has block will slide down again. mgsi‘np :- 5.38A/ 12. You are a civil engineer designing a road that has a speed limit of 100 km/h. There is curve on road with a radius of 150 m. (a) What should be the minimum value of the coefficient of static friction between the times and the road that allows cars to turn safely at the speed limit? (b) What is the proper banking angle so that cars, moving at the speed limit, can turn the curve safely even in extreme weather conditions where the road is practically frictionless? a) 5,, a. [747‘ (Wham/(col) CWWI we hat/a my} Ms m?) = T 2 ' )2 ewes: v .. cum/s Rs '- Cléom)(q.go~/$3) _\‘.:'> 1W5 :- b) 5r a banked fur-Hanks; Cugw, we have mvz 13 Sing '5- “'73— ); 6059 ‘-'- mfl ...
View Full Document

Page1 / 6

phys200_sample_midterm_solution - Sample M ioléerm g...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online