Tension in Cable - General Physics - Solved Exam, Exams of Physics

Download Tension in Cable - General Physics - Solved Exam and more Exams Physics in PDF only on Docsity! Physics 220 -— Final Exam “t December 15 2000 This mam consista of 25 probleme on 15 pages. Please check that you have them all All of the formolas that you will need are given below. You may also use a calculator. sind = y/r ong 8 me tie tan# = y/r r ¥ average speed = Sittence irersimt 9 = 98 m/s A average velocity = 7 = lepleceneet * instentapecus velocity = slope of position venmag time instantansaus acceleration = slope of velocity versus time For constant acceleration: 5m my + ut + Lov? v= uy + at w= uf +2a(e — 2g} F = ma FRE, = us (static friction) Fheiatn = pas ¥ (aliding friction) Fprcity = Sty G@ = 687% 10-4 Nats? a = wy EE = bm? W = Fd coed PE satg = mgh power = work/At B= mi Ap = impylee = F At Boring = — kr PE pring = Hex? z= Asin(wt}) v= Auwcos(wt) ws fk w= avafh alm af f=1/T For constant engular acceleration: 8 = By + unt + dot? w = uy + at w? = w3 + fa(8 — A) KE=Ju7/2 befw rola @=a/r usufr oma wath The next page contalos more formulas. 7: Preseure = Fore/area Pum =1.0 x 10° Pa Arn = Agty Py + ogh + oj /2= Py + poha + pol/2 Archimedes principle: buoyant force = weight of fuid displaced AL/L = oAT PY = ak? Uj = nr 2 Avogadro's number = 6.02 x 10** particles per mole A=43l J}mole- K KEye = UT /2 k= 14x 10°" 1/K av=Q-W W = area under P - ¥ carve W =@a~ Qo Ge/Qe = Te/Tu w= fi r=1/f y = Asin(2a ft — 2ea/d) y= Acos(Dirft -— Brad} Sots = Srowee/(1bufe} vm yf Piim/h) 5. A bullet of mass 0.024 kg ig fired horizontally with a speed of 75 ms from a bridge which is 24 m above the ground below. How long does it take the bullet to reach the ground? —> kw fa) Be om ame tt je (e} Loe ; L {d} 0.608 Ox yt on Lat (6) 0.33 6 Cus 223 = 2.35 ty 6. In class we did a demonstration of tha Doppler effect. Which of the following statements BEST deocribes this effact? (a) Moving things emit sound. Com frequency of a wave as detected by ea obearver depends on the speed To) BOUrce, {c) The Doppler effect only applies to sound waves. (d} All sound waves travel at tha same speed. {e} The Doppler effect makes the frequency of ¢ sound higher. T. Find the average speed of an angon atom in tha atmosphere, Assume that the at- mosphere can be treated as an ideal gas (this is actually a good approximation) at 4 tamperature of 300 K. The atomic masa of argon is 40 g {not kg). {a} 14 m/s 7 i (b) 190 m/s ve > 2k fe) 530 m/s F Aue (d) 31 m/s " ow Te . Ze he KO «7% | - zat ey ffé-02 we ve Va yO Dee & You are a lucky child at Christmas and receive 6 special frictionless skateboard. Ta tey it out you go te the top of a bill and coast down. Tf the hill ig 12m above the level ground below, how fast will you ba going when you reach the bottom of the hill? Ignore air resistance. iw a} 15 m/s ra (b} 240 m/s mash = t ne (e] 11 m/s = a ( 98 mp (OR Nath = Bes (e) 5.6 m/s af — 9. A baseball of mesa 0.15 kg ig threw with an initial speed of 35 m/s, You are an extremely good batter, and hit the ball directly back towards the pitcher. If your bat imparts an impulse of 15 kg — m/s" to the ball, what is the apaed of the ball just after it leaves your bat? _ ms APs Tas puta OR oA, fa} 100 m/s y (b} 15 m/s Aw For ee feu fe] 3 m/s “ at ‘d) 65 m/s “asf. a . H7rt 63244 fe) 20 m/s ve 2 [Po ——__ 10. A plank is balan: dn two supports aa shown below. The mass of the plank is 25 ke, and its total length is 3.5 m, The support ou the left exerts an upwarda force F, on the plank, and the support on the right exerts an upwards force of F'n. Find F;. Assume that the mass of the plank is distributed uniformly. 2.5 > = 2.7m ——— he (a) 130N Vw A Cy eT beat pout {c) 4501N F anal DW tyae (a) 38 N -f 44) 70 (2) 190.N F (2.7)- wl 88 a a 2etFF 7) WA | a an x at = fia 15. The water pressure in the pipes in your house is 4.0 x 10° Pa. If one of the pipes springs @ small leak, what is the speed of the water as it sprays out of the leak? (Potm = 1.0 105 Pa, Suater = 1000 kg/m?) <0 J hea 21 o/s 1 £ gh, t F pa” (b) 28 mje Papyeet kya BAP 2 Tae (c} 4.8 m/s al £ £ par,” (6 ows oer = flere é vf 2 4 oxeg® pn? S$) ptfm fi P.axeo - Wh: LM ee : 16. Consider a piece of metal which is 1.2 m long. If it is cooled by E7G, the length decreases by 2.2 x 1074 so. Find the coefficient of thermal expansion. fab 1d = lol yc fe} 1.9 x 10-9 72°C og = i, AT "La a ty 17. Imagine that your are siti room full of oxygen molerples at 300 K. If the mom is 10x 10x23 m°, find the number of axygen molecnles in the room. Pi, = 1.0 x10? Pa. {a} 40 (b) 4.0 x 10+ 40x19 ‘py~* er PY. at fue ar 2) 12x 10 * a ) ia 1 Roe: 3% 4 gaxre yinte > ae fda = wie ast 27 = 42x ———ar 18. Ifa piston containing an ideal gas is compressed and beat is allowed to flow ia or out as necessary a0 as to keep the temperature fixed, what will be the nature of the resulting haat flow? 9) Heat will flow inte the piston from the guzroundings. (b)_ Heat will Gow out of the piston into the surroundings. 2 {c) There will be no heat Bow inta or out of the piston. 19. You like te ride rollerenasters. Your favorita one hae a circular shape with radius 20 m. When you are at the top, you fel aa if pour weight is only 6 third of your true weight. eee ee et {a} 14 m/s 4 tb) 130 m/s ma v= a {ce} 1.6 m/s f (a) 51s yrs Ge ni - 2 ws 3 —_ 3 = fleas — 20. The earth has a radius of 6.4 x 10° m and completes one revalution ebout its axis in 24 hours, Find the speed of a point at the equator. {a} 1.7 x 10° m/s b) 570 m/ _ 2 2h 2 Gas VENER fi) (9 2 - 2m bE 2 70% 24: 60-60 9