TIME OF COMPLETION NAME SOLUTION DEPARTMENT OF NATURAL SCIENCES. PHYS 2211, Exam 2 Section 1 Version 1 October 18, 2013 Total Weight: 100 points


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1 TIME OF COMPLETION NAME SOLUTION DEPARTMENT OF NATURAL SCIENCES PHYS, Exam Secton Verson October 8, 03 Total Weght: 00 ponts. Check your examnaton or completeness pror to startng. There are a total o nne (9) problems on seven (7) pages.. Authorzed reerences nclude your calculator wth calculator handbook, and the Reerence Data Pamphlet (provded by your nstructor). 3. You wll have 50 mnutes to complete the examnaton. 4. The total weght o the examnaton s 00 ponts. 5. There are sx (6) multple choce and three (3) calculaton problems. Work ve multple choce problems and 3 calculaton problems. Show all work; partal credt wll be gven or correct work shown. You may work out all sx multple choce problems or an extra credt. 6. I you have any questons durng the examnaton, see your nstructor who wll be located n the classroom. 7. Start: :00 a.m. Stop: :50 a.m PROBLEM POINTS CREDIT TOTAL 00 PERCENTAGE
2 CIRCLE THE SINGLE BEST ANSWER FOR ALL MULTIPLE CHOICE QUESTIONS. IN MULTIPLE CHOICE QUESTIONS WHICH REQUIRE A CALCULATION SHOW WORK FOR PARTIAL CREDIT.. A body allng through the atmosphere (do not gnore ar resstance) gans 0.0 J o knetc energy. The amount o gravtatonal potental energy that s lost s a. 0.0 J. b. More than 0.0 J. c. Less than 0.0 J. d. Impossble to tell wthout knowng the mass o the body.. A constant orce F = ( j) N acts on an object undergong a dsplacement x = ( j) m. How much work s done by the orce on the object? a. 3.0 J. b J. c J. d J. 3. Negatve work done on an object by an appled orce mples that a. The knetc energy o the object ncreases. b. The appled orce s not constant. c. The appled orce s perpendcular to the dsplacement. d. The appled orce s drected opposte to the dsplacement. PHYS Exam, Verson Fall 03
3 4. Whch one o the ollowng reebody dagrams best represents the reebody dagram, wth correct relatve orce magntudes, o a person n an elevator that s travelng upward but s gradually slowng down at a rate o 9 m/s? F s the orce o the loor on the person and F g s the orce o gravty on the person. Please crcle. The one n the center (thrd rom the let). 5. A box o mass m s pressed aganst (but s not attached to) an deal sprng o orce constant k and neglgble mass, compressng the sprng a dstance x. Ater t s released, the box sldes up a rctonless nclne as shown n the gure and eventually stops. I we repeat ths experment wth a sprng o sprng constant k a. Just as t moves ree o the sprng, the knetc energy o the box wll be twce as great as beore. b. The box wll go up the nclne twce as hgh as beore. c. Just as t moves ree o the sprng, the speed o the box wll be tmes as great as beore. PHYS Exam, Verson Fall 03 3
4 d. All o the above choces are correct. e. None o the above choces s correct. 6. You swng a bat and ht a heavy box wth a orce o 500 N. The orce the box exerts on the bat s a. Exactly 500 N whether or not the box moves. b. Greater than 500 N the box moves. c. Greater than 500 N the bat bounces back. d. Less than 500 N the box moves. e. Exactly 500 N only the box does not move. 7. An 8.00kg sled s ntally at rest on a horzontal road. The coecent o knetc rcton between the sled and the road s The sled s pulled a dstance o 3.00 m by a horzontal orce (n 3 Newtons) o.50x 3.50x. F x a. Fnd the work done by the appled orce. 3 3 W A (.50x 3.00x ) dx J b. Fnd the energy dsspated by rcton. W k mgx J c. Fnd the change n the knetc energy o the sled. K WNET 64. J ( 58.8 J) J PHYS Exam, Verson Fall 03 4
5 d. Fnd the speed o the sled ater t has traveled 3.00 m. W NET K K W NET V.5 m / s m 8. Block A o mass 8.00 kg and block X are attached to a rope that passes over a pulley. A 50.0N orce P s appled horzontally to block A, keepng t n contact wth a rough vertcal ace. The coecents o statc and knetc rcton between the wall and block A are μ s = and μ k = The pulley s lght and rctonless. In the gure, the mass o block X s adjusted untl block A descends at constant velocty o 4.75 cm/s when t s set nto moton. What s the mass o block X? Mass X: T w X m x g Mass A: n P N PHYS Exam, Verson Fall 03 5
6 T w A n k Combnng the two equatons: m X g m A g n k m X kg 9. A 3.0 kg stone sldes down a snowcovered hll, leavng pont A wth a speed o.0 m/s. There s no rcton on the hll between ponts A and B, and no rcton on the level ground at the bottom o the hll, between B and the wall. Ater enterng the horzontal regon, the stone runs nto a very long, lght sprng wth sprng constant.00 N/m. a.what s the speed o the stone when t reaches pont B? Assumng the zero level o gravtatonal potental energy at the bottom o the hll: E mgy E E E mgy V V gy.7 m / s b.how ar wll the stone compress the sprng? PHYS Exam, Verson Fall 03 6
7 E mgy E kx E E mgy kx x ( mgy ) / k m c.wll the stone move agan ater t has been stopped by the sprng? Yes, t wll bounce backward. As t does the elastc potental energy wll convert nto knetc energy and eventually nto gravtatonal potental energy as the stone moves up the hll. PHYS Exam, Verson Fall 03 7
8 PHYS Exam, Verson Fall 03 8
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