Carry three significant figures throughout your calculations; for example 2 m means 2.00 m, and don t round 431 to 430. I mr. hoop. I mr.

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1 Physics 05 Exam Sec. Hess (-08) -digit CID# You ae allowed pencils and a testing cente calculato (should be povided without chage). No scatch pape is allowed. I you need moe pape, you may sepaate the exam and use backs o pape then estaple exam. A oeign language dictionay is allowed i English is not you native language. Do all you wok on the exam itsel. When you ae conident you have ound the coect answe, ill in the appopiate bubble on the scanton sheet. Check you wok. No patial cedit given. Cay thee signiicant igues thoughout you calculations; o example m means.00 m, and don t ound 4 to 40 F ma W mg N N s s k k W F x KE PES kx FS kx KE PE cos PEG mgy W nonconsevative ( KE PE ) ( KEi PEi) W nonconsevative W P Fvcos t p p i p p F t xim i vm i i xcm vcm Fext macm mtotal mtotal F F 0 av av t t i t avt av i it t i s v at v v at ac t v Fc mac m m Ft mat KEot I KE KE ot I I m i i I Icm Mh I mr I I hoop disk, cyl, od sphee 5 mr mr Iod cente ml L I L m F m V F P P Po gh A J Av Av 4 R ( Pi Po) J 8 L P v gh P v gh v gh Constants g = 9.80 m/s kg wate 000 m Patm.00 N / m 4.70 lbs/ in G = 6.67 x 0 - N.m/kg 5

2 . A boy puts a bowling ball (m = kg, R = 0.08 m) on the loo, and stats it spinning aste and aste with the tangential iction oce o his two hands. He does this o 4 seconds, and then the ball is spinning at 50 ad/sec. The aveage oce om one o his hands is N. a) 0 to b) to c) to d) to 4 e) 4 to 5 ) 5 to 6 g) moe than 6. Two cas ae exactly the same make and model, and thei dives weigh the same. But one has special lage, massive wheels and the othe has special small, light wheels. I they have the same speed, which one will oll uthe up a hill i the engines and bakes ae not used? a) big wheeled ca b) small wheeled ca c) same height. The kinetic enegy o solid disk o mass kg olling at a speed o 4 m/s is J b) 5 to 0 c) 0 to 5 d) 5 to 0 e) 0 to 5 ) 5 o moe 4. An elevato o mass 00 kg is attached by a cable to a lage lywheel o I = 700 kgm and adius o 0.5 m. In an accident, the bakes ail, and the elevato alls and makes the lywheel otate as the cable unwinds. When the elevato has allen 5 m, it is going m/s. b) 5 to 0 c) 0 to 5 d) 5 to 0 e) 0 to 5 ) 5 o moe 5. Fou masses, each kg ae attached to a light squae ame with sides o m. I you otate this about an axis though the cente (dot in dawing), pependicula to the plane o the squae, the moment o inetia is kg m b) 5 to 0 c) 0 to 5 d) 5 to 0 e) 0 to 5 ) 5 o moe 6. An ice skate with he ams extended is spinning at a ate o ev/s. He moment o inetia about he cente is kg m. When she pulls he ams in, she stats to spin at a ate o.5 evs/s. He new moment o inetia is kg m. a) 0 to b) to c) to d) to 4 e) moe than 4

3 7. (continued) The skate does J o wok duing the pocess. Be caeul with units. a) 0 to 0 b) 0 to 40 c) 40 to 60 d) 60 to 80 e) 80 to 00 ) moe than You ae quite lazy, but have been paying attention in you physics class. You e sitting in you chai and instead o getting up to open you doo (moment o inetia 7.67 kg m ), you thow a kg piece o clay 5 m/s in a line pependicula to the doo, and it sticks to the doo 0.75 m om the hinge. You doo is now opening at ads/s a) 0 to 0.5 b) 0.5 to 0.5 c) 0.5 to 0.45 d) 0.45 to 0.55 e) 0.55 to 0.65 ) 0.75 to 0.85 g) moe than We place satellites in obit aound the eath. The moe massive satellites must be placed at a) lowe obits b) highe obits c) neithe (no satellite mass dependence) 0. Pluto s mass is.05 x 0 kg (only 0. % that o eath). Pluto s adius is 50 km (only 8% that o Eath s.) The acceleation due to gavity o a ball you thow on Pluto s suace would be m/s a) 0 to 0. b) 0. to 0. c) 0. to 0.4 d) 0.4 to 0.8 e) 0.8 to.6 ).6 to. g) moe than.. You have a sping o unknown sping constant attached to the bottom o a pool o wate. When you attach a kg block o wood ( = 795 kg/m ) to the sping, you notice that the sping stetches. The buoyant oce on the wood block is N b) 5 to 0 c) 0 to 5 d) 5 to 0 e) 0 to 5 ) moe than 5 m. (continued) The sping stetches cm. Theeoe, the sping constant is N/m. a) 0 to 0 b) 0 to 0 c) 0 to 0 d) 0 to 40 e) 40 to 50 ) moe than 50. (continued) I you eplace the wood block by a steel block o the same size, the buoyant oce will a) incease b) decease c) stay the same

4 4. I the tanks ae identical, which o the ollowing is tue concening the pessue on the bottom? The tubes ae open to the ai. wate oil oil = 790 kg/m wate = 000 kg/m 5 m 6.5 m a) P wate > P oil b) P wate = P oil c) P wate < P oil d) depends on the tank size 5. A cetain luid has a density o 700 kg/m. On Mas, whee g =.7 m/s, and the atmospheic pessue is 600 Pa, you could suck this luid up a staw o tube to a height o m above the liquid. a) 0 to 0. b) 0. to 0. c) 0. to 0.4 d) 0.4 to 0.8 e) 0.8 to.6 ).6 to. g) moe than. 6. Conside the ollowing pipe though which wate is lowing: I R = 0 cm and = cm, a) 0 to 0 b) 0 to 60 c) 60 to 0 d) 0 to 60 e) moe than 60 v v =. v wate = 000 kg/m v R 7. (continued) P = 0 kpa at the naow potion on the ight. I duing each second, one kg o wate lows though the system, P = kpa. a) 0 to 8 b) 8 to 0 c) 0 to d) to 4 e) 4 to 6 ) moe than 6 8. A lage wate towe has a wate level 50 m above the gound and is open at the top. A valve o adius cm is opened at gound level to dain it. I thee is no iction, it will stat to dain at a ate o m /minute. a) 0 to b) to 4 c) 4 to 8 d) 8 to 0 e) 0 to ) moe than

5 9. Two pipes o the same length ae each connected to a pessuized tank, and cay viscous pancake syup om it to the bottles o packing. Speeds ae low enough to ignoe the Benoulli eect. One tube is two times as wide as the othe. How much aste will the lage tube ill syup bottles than the naow tube? a) x (no aste) b) x c) x d) 4 x e) 8 x ) 6x g) x h) moe than x 0. The most impotant eatue o a wing to povide lit is its a) ability to delect ai downwad b) thickness c) cuved shape. As a moon o mass m goes aound a planet o mass M, it has an angula velocity. Which equation is tue? a) e) m GmM b) ) GmM c) g) d) h) m. A gymnast (essentially a uniom od o mass M and length L) is vetical on the high ba, standing on his hands. He swings without iction o changing shape down to hanging vetically below the ba, and at this point his eet have a speed o a) gl b) gl c) gl d) gl e) 5gL ) 6gL g) 7gL.. In which o the ollowing is the net toque the lagest? a) I b) II c) Same I II F 0º F

6 4. Mak ALL that ae tue ( means sum) a) The F on an object can be zeo and the be nonzeo. b) The on an object can be zeo and the F be nonzeo. c) The on an object detemines how the cente o mass acceleates 5 poo 5. You (60 kg) and you little bothe (0 kg) ae playing on a uniom teete-totte that is balanced exactly at the middle. You bothe sits down on one end. You must sit m om the pivot so that it balances. The length o the teete-totte is m. a) 0 to 0. b) 0. to 0.4 c) 0.4 to 0.6 d) 0.6 to 0.8 e) 0.8 to.0 ).0 to. g) moe than. m 6. I the tension in the uppe ope is 650 N, and the weight o the beam is 00N, the hanging weight must be N. a) 0 to 00 b) 00 to 00 c) 00 to 00 d) 00 to 400 e) 400 to 500 ) 500 to 600 g) moe than (continued) The hoizontal (x) oce o the pivot on the beam must be N a) 0 to 00 b) 00 to 00 c) 00 to 00 d) 00 to 400 e) 400 to 500 ) 500 to 600 g) moe than Shotly ate deployment a satellite is set spinning to help it stabilize its pointing diection. I it acceleates while tuning a total o 00 evolutions in 60 seconds, the angula acceleation is evolutions/s a) 0 to 0. b) 0. to 0.4 c) 0.4 to 0.6 d) 0.6 to 0.8 e) 0.8 to.0 ).0 to. g) moe than. 44 good 9. 4 adians is the same as degees a) 0 to 0 b) 0 to 0 c) 0 to 40

d) 40 to 80 e) 80 to 60 ) 60 to 0 g) moe than 0 0. A ball o adius 0.8 m is olling at a speed o 8 m/s. Its angula velocity is ad/sec. a) 0 to 0 d) 0 to 5 b) 0 to 5 e) 5 to 40 c) 5 to 0 ) moe than 40.

7 d) 40 to 80 e) 80 to 60 ) 60 to 0 g) moe than 0 0. A ball o adius 0.8 m is olling at a speed o 8 m/s. Its angula velocity is ad/sec. a) 0 to 0 d) 0 to 5 b) 0 to 5 e) 5 to 40 c) 5 to 0 ) moe than 40. A olle coaste goes ove the top o a hill with adius o cuvatue. Which equation descibes the nomal oce the ides eel? a) b) c) N N mg mg N d) e) N mg N mg. You twil a ball o mass 0.5 kg on a sting, length m aound you head in a hoizontal cicle, at a constant speed o m/s. The tension in the sting is N. a) 0 to e) 5 to 6 b) to ) 6 to 7 c) to 4 g) moe than 7 d) 4 to 5. A Feis Wheel is tuning clockwise as shown, but is speeding up. The acceleation o the seat at point P has component(s) in which diection(s)? ALL that apply a. let b. ight c. up d. down 4. Aztec peomes in Mexico spin aound a lage pole om opes that attach at the top and to one leg. I the length o the ope is 0 m, and the angle between the ope and pole is 0 degees, thei speed must be m/s. a) 0 to 7 b) 7 to 8 c) 8 to 9 d) 9 to 0 e) 0 to ) to g) moe than P Mak

Physics 1114: Unit 5 Hand-out Homework (Answers)

Physics 1114: Unit 5 Hand-out Homewok (Answes) Poblem set 1 1. The flywheel on an expeimental bus is otating at 420 RPM (evolutions pe minute). To find (a) the angula velocity in ad/s (adians/second),