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PHYS222 ExamASpring2007

# PHYS222 ExamASpring2007 - Physics 222 NAME Exam A(PRINT...

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Unformatted text preview: Physics 222 NAME Exam A (PRINT) February 8, 2007 1. Ifthe mean life of a nucleus were 4.0 x 10"Jr 3, what would the measured mean life be if the nucleus were moving at speed 0.90 c? a. 4.0 x1013 U = '9‘ b. 1.7 x10‘ 5 O c. 9.2 x10'7s O 7' d. 21 x 105 '7 43: 4.0mm- 0/:ng f": 2.2? ("Nils l 1'. -1 K l,co.?e-)‘ :3 9.2210 5 ‘3. f“ ‘ ' : 2.2.? ,_..___. : ile-Bl t W 2. How fast would a spaceship have to travel so only one year of travel time (as measured aboard the spaceship) elapses as it goes to a distant star system in a trip that measured from earth takes ﬁve years? a.50 b. c/5 c. 0.86 d. 0.980 3. A beam of light is moving in the same direction as an object is traveling. Ifthe object is moving at speed 0.70 c, how fast is the light moving as it passes the object? a. 0.3 c d. 1.7 c See ‘ S‘pcepJ Fag-LLA‘AZ. C .—-—-"-"" r..- 4. One proton is moving at speed 0.4 c and another proton is moving at speed 0.8 c. The ratio of the relativistic mass of the faster proton to that of the "slower is a. 1.0 b. 1.5 c. 2.0 d 23 V M if M : a e v we; ' .44 wire, 1‘ xm —-—---" lm'q‘ Y4: __..-——-‘————-" I Q‘fc Ti ::(1:.35c SP3 J Qg L7 f5 Ccssz'Aﬂ4/ 5. Ifthe total energy of a proton is ten times its rest energy, what is its speed? a. 0.994 c b. 0.995 c c. 0.996 c d. cannot be found without the rest mass of a proton. , z .— - Kr = («m-ma) c i: 2' l 0 t: 0 '2. : ( r0“: 'lﬂo) C E: K 4— Ea =64)ch ’05,:k4~l£o :(y'ng‘ K: 9:: : mam, OlEo : Wig—Ea ’- Xlio: I05? Ca. lea ‘2 I ['93 CL— 2. [*3— :1 _.L.- L” law 2. 0. Th:- l» e£:c99‘i 6. Start with a railroad car on a frictionless track and use the example of a pulse of light with energy AE traveling ﬁ'om one end of the car to the other to derive AB : Ame2 . You must deﬁne all terms careﬁilly and explain each step. 5%? Reltlnéctlo'c EXAvu’L‘ 6m H-m prev“ 7. A system is devised to exert a constant force of 8 N on an 80 kg body of mass initially at rest. The force pushes the mass horizontally on a frictionless table. How far does the body have to be pushed to increase its mass-energy by 50%? K -. 5 From. K wig“!- FS‘ K r: (Mr/MAC.» —- -— 1:6 = “ML-4”" 3 YMQCL'MOCZ 2 F8 :- “OM96 £3— : [.5 Mo -IW :5 l7; I.— FS : (LS—’0Mpé 0.5M“; S S —-' t, 2.. __ (as'lyohc g/V f :7 3 52": 44.5205”: ...
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PHYS222 ExamASpring2007 - Physics 222 NAME Exam A(PRINT...

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