NAME Borough of Manhattan Community College Course Physics 110 Sec 721 Instructor: Dr. Hulan E. Jack Jr. Date December 19, 2006
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1 Brug f Manattan unity llege urse Pysics 110 Sec 721 nstructr: Dr. Hulan E. Jack Jr. Date Deceber 19, 2006 inal Exa NSTRUTONS - D 7 prbles : D Prble 1, 2 fr Prble 2,3 and 4, 2 fr Prbles 5,6 and 7, 2 fr Prbles 8,9 and 10 nly grade 7. HEK THE ONES YOU WANT ME TO GRADE! Nt aving standard easuring instruents lengts are easured in strings ( piece f string easured fr te tip f te nse t te tip f te rigt tub) and tie in snap (snaps f te finger). An bject is easured travel 3.6 strings in 2 snaps Nrt. a. Wat is its velcity? Explain (2 pts) b. Wat is its speed? Explain (1 pts) c. Wat wuld its units f acceleratin? Explain. (2 pts) d. Yu find tat a 1 string = 0.90 eters and 1 snap = 1.5 sec. (5 pts) 5.0 strings/snap =? /s? 2. Te frces 1, 2 and 3 act n te bdy as swn. a. On te figure, sketc te net (ttal) frce, net, acting n te bdy. (5pts) b. Briefly explain wat yu did. (10 pts) Page 1 f 5
2 3. A car traveling alng a straigt rad as te fllwing x vs t curve. Of te tie perids, A, B,, D, E, a. Wic as te largest velcity? (1 pts) Explain.(4 pts) A B D E b. s te velcity ever zer? (1 pt) Explain. (4 pts) c. s tere and perid tat te car as a cntinuus acceleratin? (1 pt) Explain (4pts) 4. A bdy f ass is at rest at a eigt H abve te grund were drpped. Te bdy is swn at eigts H, 3/4H, 1/2H, 1/2H and H=0 (just BEORE it its te grund). At eac psitin Energy Bxes are swn wit te Ptential Energy, PE, value. a. Explain wy te PE as te values swn in eac psitin. (5 pts) n air resistance PE=gH H PE=3/4gH 3/4H PE=1/2gH wit air resistance PE=1/2gH Using nservatin f Energy KE 1 +PE 1 = KE 2 +PE 2 +Wrk 1->2 b. Briefly Explain wat in te rest f eac bx wen tere is n air frictin.(5 pts) 1/2H grund PE = 1/4gH 1/4H PE = 1/4gH just BEORE it its te grund c. Briefly Explain wat in te rest f eac bx wen tere is air frictin.(5 pts) Page 2 f 5
3 Brug f Manattan unity llege urse Pysics 110 Sec 721 nstructr: Dr. Hulan E. Jack Jr. Date Deceber 19, 2006 inal Exa 5. Te picture sws tw views f a bdy suberged in a fluid tat is uc re denser tan air. Te tp f te bdy is a dept H belw te fluid surface. Te bdy as a luid Surface eigt. Te fluid pressure P fluid, n a P tp = ρ fluid ghsuberged P tp = ρ fluid ghsuberged surface a dept H belw te surface P = H suberged ρ fluid gh, were ρ fluid is te density f te fluid. a. Write te relatin between pressure and frce (5 pts) b. Explain wy te bdy weigs less in tis fluid tan in air. (10 pts) P Btt= ρ fluid g(h suberged + ) A suberged bdy H suberged P Btt= ρ fluid g(h suberged + ) 6. Te Newtn s Law f Gravitatin, G, is G = - G 1 2 /r 2 ulbs Law fr electric carges, E, is E = k Q 1 Q 2 /r 2 G is te Universal Gravitatinal nstant = 6.7x10-11 N 2 /kg 2 and k is te Electrstatic nstant = 8.98x10 9 N 2 / 2 n te Sun-Eart syste, te eart travels in a circular rbit arund te sun. n te ydrgen at te electrn travels in a circular rbit arund te prtn. Sun r v rbit Eart Q Prtn Prtn r v rbit Electrn Q Electrn a. s tere any acceleratin?(1pt) Explain. (4 pts) Sun-Eart Syste Hydrgen At b. Hw des Newtn s 2 nd Law f Mtin apply t tese situatins? Explain. (10 pts) (Be specific abut wat frce were, if it applies) Page 3 f 5
4 7. We ften ave t g back and frt between teperature easured n te areneit and te entigrade scales. Te picture f te tereter sws te defining relatinsip between te tw teperature scales. On te straigt line grap sw tat = 9/ ELSUS r ENTGRADE BOLNG 100 WATER AHRENHET Explain wat yu did. (15 pints) (Hints :9/5 = 180/100, rise, slpe, intercept ) E WATER MXTURE As swn in te pictures, a balln expands as it is eated. ts teperature increases by ΔT and its radius increases by ΔR. Te atsperic pressure always pints twards te center f te balln and is perpendicular t te surface f te balln. Te 1 st Law f Terdynaics states Q = ΔU + Wrk,. a. Wat is U? Des it cange ere?(1pts) Explain. (4 pts) T cl T+ ΔT tter R+ R Δ ΔR b. s any wrk dne? (1 pts) Explain (5 pts) Q Heater c. Hw des te 1 st Law f Terdynaics apply ere. (4 pts) Page 4 f 5
5 Brug f Manattan unity llege urse Pysics 110 Sec 721 nstructr: Dr. Hulan E. Jack Jr. Date Deceber 19, 2006 inal Exa 9. n buildings electricity is distributed r delivered by parallel circuits. Te resistrs, R 1, R 2, etc, represent individual tings like a stve, a TV, a cputer, a ligt. s are currents and V s are vltage drps acrss resistrs. a. Suppse R 1 is a cputer. Wat appens t te current trug te ter resistrs wen yu turn te cputer ff? Brielfy Explain. n te parallel circuit (5 pts) Parallel ircuit R 2 R3 vltage surce Series ircuit R 2 R 3 vltage surce n te series circuit (5 pts) b. f furt resistr, R 4, is added t te parallel, wat appens t te currents in te ter tree resistrs? Explain (5 pts) 10. Tw carges, f equal agnitude but ppsite sign, lie alng a line as swn in te diagra. On te picture, using arrws, indicate te directins f te electric field at pints A, B,, and D swn n te diagra. Te electric field, E = /q, is te frce/carge, N/(ulb). T ake te easureent yu are using a very, very, very sall psitive test carge at eac pint. a. Briefly describe w yu easure te electric field, E. (5 pts) b. D it. (10 pts) Page 5 f 5
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