Physics Boynton Exam 2 Answer Key

Physics Boynton Exam 2 Answer Key - 4% WM” 1. A solid...

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Unformatted text preview: 4% WM” 1. A solid sphere and a hollow sphere are released from rest at the same height and at the same time on an inclined plane. They roll without slipping to the bottom and arrive at exactly the same time. We can conclude that a) they have the same mass b they have the same radius hey have the same mass AND radius they have the same moment of inertia fi’this is impossible 2. A flatbed truck is carrying a 90.0-kg crate along a level road. The coefficient of static <9 friction between the crate and the bed is 0.250. What is the maximum acceleration that the truck can have if the crate is to stay in place? 2.45 W52 b) 5.00 mlsz c) 19.5 mis2 . d) 49.1 W32 e) 122 rats2 ('9 '3. Pulling out of a dive, the pilot of an airplane gu' - the bottom of the dive, the sped of the airplane i -- - ‘ ' l' he ilot'saaren ' lane into a vertical circle. At What is the ._ut.-..... r=_ - ius @ ies @228 m b) 735 m c) 1490 m d) 1740 m e) 2240 m - - ' t is not to excee on that surface. If the light is reflected rather than absorbed, the force will be a) greater Pless c) equal either way 0 d) insufficient information to kn e) none of these 5. A pulley hgsraaéeifialgngular speed o@dfs and a constant an , acceleration 3.41 rad! . Through what angle does the pulley tur n 5.26 s ’ "‘7 M £61 4. Light carries momentum, so when a beam impinges on a surface, it will exert a force a) 19.3 rad b) 42.6 rad c) 82.7 rad @113 rad e) 160 rad 6. The kinetic energy of a particle of mass m, as shown in the picture below right, is 5.0 - J at point A. lts kinetic energy at points B, C, D, E, and its turning points are - a) None of these b) 2.0 J, 6.0 J, 5.0 J, 10.0 J, A and E c) 8.0 J, 4.0 J, 5.0 J, 0 J, not shown 13.0 J, 9.0 J, 10.0 J, 5.0 J, A and E e) 13.0 J, 9.0 J, 10.0 J, 5.0 J, not shown 1.0111 2.0111 3.0m 4.0m 5.0m WSmemm.n 7. An object of mass 2 kg )is held at thetop of a triangular wedge as shown in the figure, and then rele . The r lice Ie for potential energy is at the base of the riangle. Neglect friction and u g = 10 W82. What is the amount of work done by the gravitational force as the object es to t ottom of the wedge? a)60J b)10.l ch d)40J @SOJ @ 8. A ball is tied to a string and twirled in a horizontal circle above the person’s head. If the string were to break, the ball would a) Drop straight to the ground. b) Continue moving in a circular path until air resistance causes it to stop. Spiral inward toward the center of the circle. Fly off in a straight line tangent to the circle and then move in a parabolic trajectory. 9. A 220—kg object is lifted at a constant speed through a height of 42 m by a crane. If Q9 the crane takes a total time of 1.8 seconds to lift this object, what is the average power required? Use 9 = 10 W52. 1 kW b) 25 kW I c) 75 kW d) 100 kW e) 150 kW 10. The ratio of the Wm the initial kineti y of an object is one half. If the initial velocity of the object is 10 mls. what is the final velocity? a) 8.0 mis b) 7.1 mls mls d) 50.0 mis e) 0.14 W5 1 1. Swimmers at a water park have a choice of two frictionless water slides (see Figure). Although both slides drop over the same height, h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. How does the speed v1 of a swimmer reaching the end of slide 1 compare with V2, the speed of a svvimmer reaching the end of slide 2? .--\ I 3) V1 3‘ V2 V1 < V2 {Q/WH = V2 d) No simple relationship exists between v1 and v2. A 31.11%; '1 MM, .4—« {If 5/9’77 'H l in l L 12. A SOD—kg cannon fires a 4.0-kg projectile with a velocity of 500 mfs relative to the ground. What is the recoil speed of the cannon? '7'“ a) 1.0 mls b) 2.0 mls ® 4.0 mls d) 6.0 mls e) 8.0 mls 13. A SOD-kg cannon fires a 4.0—kg projectile with a velocity of 500 mls relative to the ground. What is the recoil speed of the cannon?- [A] 1.0 mils [B] 2.0 rats ['0 4.0 mrs [D] 6.0 ms [E] 3.0 mls 14. A car with tires whose radius is 35 cm is traveling along a highway at 29.8 mls. What is the angular speed of the tires? ' [A] 90 radi's 85 radis {C} 80 radfs [D] 75 radfs [E] 70 radls the crane takes a total time of 1.8 seconds to lift this object, what is the average power 15. A 220-kg object is lifted at a constant speed through a height of 42 m by a crane. If 0 required? Use 9 = 10 misz. [A 1 kW [B] 25 kW [C] 75 kW [D] 100 kW [E] 150 kW fag __I\ An object of mass m = 20 k ' on a rough inclined plane wit height . length 8/; m. and which makes a i" ith the horizontal. - s .ject is ed t we“ and it stops on a rough ho ' u . surface, at a distance . rom the bottom of the inclined(plane_, a : a e figure. The coefficient of kine Ic friction on t e inclined plane eggs/an -. lKE * w ;\gg +M‘? 4 J. :1 it QINW 4 gin-NV t/ j -J Va xxx Lb% per Mk- 0"8 fic—lohls fig“ 30 A. What is the kinetic energy of the object at the botto of the inclin Ki 5firingm F5 “a 2-? 1M0» B. What is the speed of the object at the bottom of the inclined plane? .‘I weF‘A; 17. A crate of massgtzykg sits on t - : o of a loading dock. (Use 9 = 10 mfsz) a. If the ramp is inclin at an angle uw Ind the normal force acting on the crate. b. If we assume that the surface of the : -‘ a is smooth (no friction), find the force that a worker would need to apply parallel to the surface of the ramp (x'—axis) in order to push the crate up the ramp at constant velocity. c. if the worker applies a force parallel to the 'srfigd the magnitude of the force needed to accelerate the crate up the ramp 1.5 mis . - 5% =4 0 c 1,? l: e: E Banks [$17 _ News? v? *' ""‘“ ° ...
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Physics Boynton Exam 2 Answer Key - 4% WM” 1. A solid...

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