{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

phys218-fall-2011-exam-01-with-solutions

phys218-fall-2011-exam-01-with-solutions - PHYS 218 Exam 1...

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 Document Right 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 Document Right 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 Document Right 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: PHYS 218, Exam 1 Name: E4 BN4» 11144.2( (Last) (First) (Middle) 1. Recor.s your two—digit exam version number on the scantron form in the field “TEST / QUIZ NUMB . I . 2. Write your name here and on the scantron form. 3. Record your PUID number in the “STUDENT IDENTIFICATION NUMBER” field on your scant— ron form. 4. A numeric answer that is correct to within 1% error is considered correct. 1. An airplane starting from rest must reach a speed of 215 miles/ hour Within 5 s in order to take off. What is the minimum value of the acceleration that will allow the airplane to take off? 1 mile = 1609.344 In; 1 hour 2 3600 s. (a) 43.0 m/s2 (d) 480.6 m/s2 (b 1075.0 m s2 (c) 19.2 m/s2 (e) None of the above. Ms mm \Lo1.3~H m 1 ‘M Ln —— 0 -——/’ A}: _, (ll?) '( “r > x hilt: K 36095 M W- AJ. * ”firm (in ‘51 2. A jogger starts off running down a perfectly straight road. He maintains a speed of 3.8 m/s for 200 s until he notices that he dropped his iPod. He abruptly turns and traces back along his route at a speed of 1.60 m/s for 50 m until encountering his iPod. What was the joggers average velocity between the time he started running and the time he encountered his iPod? Consider the jogger’s original direction to be the positive direction. (a) 2.941 m/s (b) 3.503 m/s (0) 3.800 In/s (e) None of the above. 33-100 : 760 hf AX 7 (0 u 0"” 2 g f“ = “f 10 «Tu: p+ 217‘ ‘ 15 S n}: = 3.0703 3. In a famous fraternity prank at MITmintended to demonstrate that any fixed length object could define a system of measurement~01iver R. Smoot was layed head—to—toe 364 times across the Harvard bridge. Thus the Harvard bridge was measured to have a length of 364 “Smoots”. Supposing that the bridge is 7 Smoots wide, what is the area of the Harvard bridge, measured in mg? Area 2 Length X Width; 1 Smoot = 1.702 m. iai 1953 m2 (d) 1497 m2 (c) 4337 m2 (e) None of the above. 7. AM‘ gkfi guts,“ X 7 SW5 ’3. 2,546 55nd} Q- 1 702- u’" L z u" ‘ l 3,54% 9 “h, X 3. Swat 7'58\ w. 4. Two books of mass m1 = 1.0 kg and m2 = 0.5 kg are stacked on a table as shown in the figure below. What is the magnitude of the normal force acting on the topmost book? (a) 0 N (d) 9.80 N b 14.70 N (c) 4.90 N (e) None of the above. Ecol; “’5 0+ (13* (C'Mslawb mlfibfi =3 D) So} 5. A car is moving along the horizontal direction toward the left. The driver kills the engine and coasts to a stop. Which of the following could be the free body diagram representing the horizontal forces on the car as the car is coasting to a stop? (e) None of the above. ———» aw» Tim m ”Wt 43 «Cm» wk; “A "’ Ahab». Jco imv; (LL wfiivm - 6. Suppose you are working out a difficult problem in energy conservation. You Google up a promising looking equation but it is from a website that you don’t fully trust. The equation is, E=M02+ F333 —— — 70:0 A Check this equation by carrying out dimensional analysis. The units for the variables are: c E: kg m2/82 oM:kg o 9: m/s2 0 6: m/s F: kg m/s2 :0: m A: m2 7: kg/8 What is the strongest conclusion that you can draw from a dimensional analysis of this equation alone? (a The e uation miht be correct. (b) The equation neglects friction. (c) The equation is definitely incorrect. (d) The equation is definitely correct. (e) None of these conclusion can be drawn from dimensional analysis. 3/ m if: “3— M S s WATT? be, OL‘ 7. Two not—too—bright furniture movers are shown below pushing a refrigerator. —> positive direction The mover on the left pushes with a force of 287 N. The mover on the right pushes with a force of —82 N. The refrigerator has a mass of 61 kg and accelerates at 0.05 m/s2 toward the right (i.e. toward the positive direction indicated on the figure). What is the force exerted by the refrigerator on the mover on the right? (a) —201.9 N ((1) —205.0 N (b) 205.0 N (c) 0 N (e) None of the above. 4“” M JVL N lid. bxw'i'c it grglbo \ no um; 3'31 Lou.) why“: Q?“ +ch it feels =3“ « QM of . +83 N w MM? 8. A car is sitting at rest on a hill with a constant incline, similar to a demonstration considered in class. The driver releases the break and the car rolls downhill. Which of the following curves could represent the acceleration of the car along the direction of travel as a function of time? Consider only the time period just after the break is released until the car is part way down the hill. The positive direction is downhill. E ' : i; cow-Sinai: g “W Iii) +Lé‘t (d) 0 time (s) (b) 0 time (S) (e) None of the above. (News ‘v-I'L outtake 9. You try to toss a screwdriver up to your father who is working on a roof. The distance from your hand to his hand is 10 m and your toss comes 2.0 m short of reaching him. What was the initial speed of the screwdriver just after it left your hand? Neglect air resistance. (a) 12.522 In s (d) 15.336 m/s (b) 1. 278 m/s (c) 2. 556 m/s (e) None of the above. ‘91 M24» x-io Lu: 2M «= "741977 “’3‘ 0 r2 _ o O :- ru‘ .. Z 1g ““5”- 2‘; ._._ qr: a la. CX*%> 3 :0 “ V \jx 1r: 123x (9:71.? mime; 10. Consider the following plot of position vs. time. E Q .9 5% Q 0 1 2 3 4 5 time (s) For what time interval is the average speed the smallest? (a)1t02s (d)3to4s (b) 2 to 3 s (c)0t01s (e)4t055 ...
View Full Document

{[ snackBarMessage ]}