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PHYS121Exam3 - PHYS 121{SPHJ NAME[print clearly EHM 3 50...

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Unformatted text preview: PHYS 121 {SPHJ NAME [print clearly}: EHM 3 50 pts maximum Discussion Section {required}: You can bring a 3x5 inch index card. Dnly non-programmable and non-graphing calculator is allowed. Write iegibiy and present your solutions in an orgonizeci and coherent form. Use pencil. ir'ou must show all worlc not just the answers. A correct answer alone will receive zero point. '11. An EDrg rubber ball is thrown horizontally with a speed of 5D mfs toward a wall. it is initiallyr traveling to the left. It rebounds with no loss of speed. The collision force is shown in the top graph below. Assume to the right as the positive direction. F a} What is the value of the maximum force Fmax? (3‘ pts} F x J??? 14; :«H‘M/S max D|':'_éfl?_/§ U I £0 10 m3 fess; I ?”Pf 7f} w J - firefly/amarr’ipoyN’ffi}“Lei/3W?" b} Draw a velocity-versus~time graph for the collision on egg/7,5 the given set of axes. Make your graph align verticallyr b- with the force graph, and provide an appropriate J W numerical scale on the vertical axis. [2 pts] ll] {rims o} Is the collision elastic or inelastic? Why? [1 pt} 11“}; {$th [12%an , 77:5, 236’?" Howls “M M Arts 47/ sffa’é x, files flu [9551f W/ - If? 3* C12. A elsrvr hall of mass M traveling in the horizontal direction strikes a block of mass 3M that’s suspended from a light vertical string of length L as shown. Thev stick together and rise until the string makes an angle of EU“ with the vertical. {Forfoii credit your soiution must include a description ofvour pion forsoiving the probiemfromfundomentoi equations, and an answer to the question posed in the problem. I a} Determine the initial velocityr of the ball, in terms of anvr or all of the following: M, L, fundamental mathematical and phvsical constants. [12 pts} Age #9 aim/wig? 3% Met a; mWE WW“ M'fw b} What percentage of kinetic energv is lost during collision? [2 ptsi “iii wwwzwugeew-g: m 4% E ii" Warm kmficifiitfi/‘iflf :3’4fiiizf5ff3 3/41]; - l 1g; I. a» News? = $le ”:"§=%:% ML W alxj Page 2 of4 {13. The spring In the figure has a spring constant of 1200 Him. It is compressed at} cm, then launches a I12 kg block. The horizontal surface is frictionless, but the 4G“ slope Is not frictionless. The block's coefficient of kinetic friction on the slope is {1.15. What is the total distance will the block travel up the slope before reversing direction? Solve this problem use work and energvinstead of kinematics. {Forfuii f! credit your solution must include proper diagrams, description of your plan for serving the problem from I'll fundamental equations, proper units, and an answer to the question posed in the problem.) [1d ptsl Miriam 7% M53?!) W/ ruffle WW2 5W. kf+l§f fflfrafiéw/ aflrsfifimg 7&wa .. 1 f r? atmrwwiwmiér =afaf-fi’k/fi) +5 4/” saw/redraw“ “I“ la a / 565% .rjjarsmlfd vr/dpy Minis}! 1:: ,§ 4555)} :4:ka r“ WW 1’- (Mr) (a 5)} .1 5‘4 : tfixfiflmfifirsi’fi’sufiareflé Arr-ff C14. While the block is moylng up the slope, as in the preyious question a} Draw a free-body diagram showing all the forces acting on the block {1 pt] b} Next to your free—body diagram, make a table showing the sign (-1-, - or [I] of: i} the work done by each force in your diagram {1 pt] ii} the net work whetll pt} iii} the block‘s change in kinetic energy ME [1 pt} {15. Balls A and B are thrown at a wall ' I same 1irelocity. Ball A bounces and Ball B sticks. Which hall exerts a larger impulse on the wall? @all B or the same for both? [2 pts} [1.6. Two ice skaters, Brian and Ashley, push off from each other. Brian weighs more than Ashley. a] Which s _ t r if either, has the greater magnitude of momentum after the push-off? Brian, Ashley or is it e same rboth? {2 pts} of FL} I l}!P 5 h] Which skater, i either, has the greater speed after the pushwoff? Bria w; or the same for both? {2 tits} (1?. It feels better to catch a baseball while wearing a padded gloye than to catch it bare handed. Why? iii! MW WW? p. W/J/m 645M clef WW/ Mf/MW $45 {*5/95 Mi 9% #8 whys? Pi wWfl ffsnfuécj j/W/ a, Mgzé/fésg 35W 143 arms-hm 153M . is? mémsfl {Xe WW firm/cs, Aw/Zéeé ...
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