Phys 111 Exam 1 September 0, 016 Name Section University ID Please fill in your computer answer sheet as follows: 1) In the NAME grid, fill in your last name, leave one blank space, then your first name. ) Write your ID number in the IDENTIFICATION NUMBER section of the sheet. 3) Write your recitation section number in the spaces K, L in the SPECIAL CODES section. Single digits should be preceded by a 0 (e.g. section 1 is written as 01). 4) Fill in the circles on the sheet corresponding to the letters or numbers of your name, ID and section with a # pencil. Note (a) Use g = 9.81 m/s if needed. (b) There are 0 multiple choice problems. (c).0 hour Exam (no one can leave before 9:15 PM). (d) Formula sheets are available (attached at the last two pages). (e) Record sheet is attached after the 0 exam problems. You cannot use CELL PHONES, ipad, IPOD... Good Luck!!! 1
1. If a is the acceleration, x is the position, v is the velocity and t is the time, which equation is not dimensional correct? A) t = x/v B) v = a / t C) t = x / a D) a = v / x E) None of them. Which of the vectors below is the vector difference of the vectors Pand Q ( P Q??) (A) Vector A (B) Vector B (C) Vector C (D) Vector D (E) Vector E 3. One mile is equal to 1609 meters; one hour is equal to 3600 seconds, mph is 1 mile per hour. The speed of 17 m/s is equivalent to the speed of: A) 17 mph B) 38 mph C) 7.6 mph D) 17000 mph E) 3.8 mph
4. You drive 4 miles at 30 mi/hr and then another 4 miles at 50 mi/hr. What is your average speed for the whole 8-mile trip? A) greater than 40 mi/hr. B) equal to 40 mi/hr. C) less than 40 mi/hr. D) equal to 40 km/hr. E) Not possible to determine from the information given. 5. A projectile is lunched from a level plane at 30 0 from horizontal with an initial velocity of 885 m/s. What is the maximum height above the plane the projectile will reach? Neglect air resistance. A) 99 m B) 13 m C) 885 m D) 1.3 km E) 10 km 6. You drop a stone from a bridge to the river below. After this stone has traveled a distance d, you drop a second stone. The distance between the two stones in air will always A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant. 7. Suppose that a car traveling to the West ( x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The acceleration is zero. B) Its acceleration is negative. C) Its acceleration is positive. D) A statement cannot be made using the information given. 8. A football is thrown toward a receiver with an initial speed of 15 m/s at an angle of 45 above the horizontal. At what horizontal distance the receiver should be to catch the football at the level at which it was thrown? A) 16 m; B) 3 m C) 31 m D) 45 m E) Impossible to solve. 3
9. You are driving through town at 1.0 m/s when suddenly a ball rolls out in front of you. You apply the brakes and begin decelerating at 3.5 m/s. How far do you travel before stopping? A) 3.4 m B) 50 m C).1 m D) 34 m E) 1 m 10. If the initial speed of a projectile is doubled, A) Its range will be increased by 1.41. B) Its range will double. C) Its range will be decreased by a factor of two. D) Its range will quadruple. E) Its range will decrease by a factor of four. 11. You apply the same force to two objects. Object 1 has mass M and object has mass 5M. The acceleration of object is A) ten times that of object 1. B) five times that of object 1. C) the same as that of object 1. D) one-fifth as that of object 1. E) has no relation to that of object 1. 1. A catcher stops a ball traveling at 40 m/s in a distance of 0 cm and feels a force of 600 N against his glove. What is the mass of the ball? A) 0.10 kg B) 0.15 kg C) 0.0 kg D) 0.5 kg E) 0.30 kg 13. A swimmer heading directly across a river reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. What is the speed of the current? A) 1.4 m/s B) 1. m/s C) 0.80 m/s D) 0.5 m/s E) 1.8 m/s 4
14. To hang a 6.0 kg pot of flowers, a gardener uses two wires - one attached horizontally to a wall, the other sloping upward at an angle of = 40.0 degrees and attached to the celling as shown in the figure. Find the tension (T 1 in the figure) in the wire attached horizontally to the wall. A) 94.7 N B) 47.4 N C) 7.5 N D) 36.3 N E) 131 N 15. A 50.0-kg box is being pushed along a horizontal surface. The coefficient of kinetic friction between the box and the ground is 0.350. What horizontal force must be exerted on the box for it to accelerate at 1.0 m/s? A) 3 N B) 60.0 N C) 491 N D) 116 N E) 17 N 16. A 50.0-kg crate is being pulled along a horizontal smooth surface. The pulling force is 10.0 N and is directed at an angle 0.0 above the horizontal. What is the magnitude of the acceleration of the crate? A) 0.0684 m/s B) 0.188 m/s C) 0.00 m/s D) 0.376 m/s E) 0.078 m/s 17. A baseball player slides into third base with an initial speed of 4.0 m/s. If the coefficient of kinetic friction between the player and the ground is 0.46, how far does the player slide before coming to rest? A) 0.54 m B) 0.89 m C) 1.8 m D).4 m E) 4. m 5
18. The figure shows velocity versus time for a runner. How far does the runner travel in 5 s? A) 10 m B) 0 m C) 30 m D) 60 m E) 70 m 19. A box of mass m 1 = 10.0 kg rests in smooth, horizontal floor next to a box of mass m = 5.00 kg. If you push on the box with a horizontal force of magnitude of F = 0.0 N. What is the magnitude of the contact force between the boxes? A) 0.0 N B) 5.53 N C) 6.67 N D) 0.0 N E) 13.3 N 0. A mass of 30.0 gram is attached to a vertical spring with a spring constant k = 15.0 N/m, and lowered slowly until the spring stops stretching. How much does the spring stretch? A) 1.800 m B) 0.150 m C) 0.0196 m D) 0.0056 m E) 19.6 m 6
Record Sheet of Exam 1, Physics 111, Fall 016 You may fill in this sheet with your choices and take it with you for comparison to the posted answers. 1 11 1 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 0 7
Physics 111, Fall 016: Formula sheet Vectors: A Acos A Asin x y 1 x y tan Ay / Ax A A A Linear Motion: x x f xi v x / t a v / t v v0 at 1 1 x v0t a t v v0 a x x v0 v t Forces: N Fnet mm 1 Fnet F1 F F3 Fi a Fg G i1 m r Weight W mg fk kn fs sn Fx kx Work and Energy: W ( F cos ) d KE mv / PE mgh P work / t Fd / t Fv Etot KE PE PE kx / Linear momentum and impulse: p mv Ft p I Ft p p 0 p f pi x m x / m cm i i i y m y / m cm i i i Uniform Circular Motion: v r / T a v / r c F c mv / r tan v / rg Rotational Kinematics: s/ r / t / t 0 t T / 1 0t t vt r t r 0 ac r Rotational Dynamics: rsinf L 0 Lf Li I miri I L / t L I KE R I / W Gravity: F Gm m r g 1 / G Nm kg 11 6.67 10 / / g 1 PE U Gm m r KE mv / Oscillations about equilibrium: f F kx x Acos( t); vx Asin( t); ax Acos( t) T k 1 1 1 L E KE PE mv kx ka T m g
Waves and Sound: F m P P 1 v f v ; I (10 db)log( I / I 0); I0 10 W / m T L A 4 r n log( A/ B) log( A) log( B); log(10 ) n 1 Doppler Effect for moving source: f0 fs (-) source moving towards observer 1 vs / v v0 Doppler Effect for moving observer: f0 fs 1 (+) observer moving towards source v Constructive Interference: d1 d n; n 1,,3,... Destructive Interference: d1 d n ; n 1,3,5,... Standing waves on a string of length L = Standing waves in a column of air open at both ends of length L L v v n ; fn n ; n 1,,3,... n n L Standing waves in a column of air closed at one end of length L 4 L v v n ; fn n ; n 1,3,5,... n 4L Beat Frequency: fbeat f1 f n Fluids: M F 5 ; P ; Pgauge P Patm ; Patm 1.01 10 N / m V A P P gh 1 F Vg Buoyant fluid m1 m Conversation of Mass : 1 A1 v1 A v t t 1 1 Bernoulli ' s Equation : P v gy P v gy 1 1 1 Temperature and Heat: 5 TC TF 3 TK TC 73.15; L L0T ; V V0T ; Q mct 9 4 8 4 Q ml ; Q ml ; Q / t kat / L; Q / t eat ; 5.67 10 W( m K ) fusion f vaporization v Ideal Gases: 3 PV nrt Nk T; n N / N m / ( mass per mole); R 8.31 J( mol K); k 1.3810 J / K B A B 3 1 3 3 3 NA 6.010 molecules / mole; KEav ( mv ) av kbt; U nrt NkBT Thermodynamics: U Q W; W PV ; CV 3 R / ; CP 3 R / ; CP / CV 5/ 3 W Qh Qc Qc Tc Qh Qc e 1 1 ; COP ; Air Conditioner COP Qh Qh Qh Th W W Q Qh Qc S ; Stotal 0 T T T h c