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exam1_2007f_sol

# exam1_2007f_sol - ExamI Physics 221,FaLt2007 1 A book is at...

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Physics 221,FaLt2007 Exam I 1 . A book is at rest on a desk top. Which of the following forces forms a Newton's third law pair with the book's weight? A) The normal force of the table on the book B) The force of the book on the table ;Q The gravitational force of the earth on the book ( D)The gravitational force of the book on the earth YI None of the above i A NJ= cn\$ : on f 6r I 3\ = t6tzN) Utru\$f \.{) ft*db]f,r>n+-0 .|"n* on tML \ Qortl^ T?r.tf lD t1 rr i, ao*r"t\^ *Y M4. 2. A 65 kg student is standing in a high speed elevatoras it accelerates upward with a: 15 m/s2. What is the magnitude of the normal force that the floor of the elevator exerts on the student? A) 338 N B) 637 N c) e75 N D) r274N @t612N N)- f , c \

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Physics 221Fall2007 Exam I 3. Three blocks are arranged on a horizontal, frictionless table as shown below. If a force of 20.0 N to the right is applied to the left mass, whatis the horizontal force on the far right mass? A) 0.606 N ,@D.82N tf,z.q: N D) r2.2 N E) None of the above fc>t t\^4- ^U-b\a- c,6( */r- 3 ob)[o- et ( 8 L N ) E,n* .( r,/*) **p+* j ,D\) ( h 36ros = | 2)xto-2 -/s 6s t\- 34 H'ct 4. The speed 150 feet lhour (ft/h) converted into S.I. units is: A) 4.16 x l0-2 ff/s B) 5.00 x l0-' in/s C\ 45.7 mlh ,ta. . ( D)rl .27 xl0-- m/s E) 0.762 m/min rr) + lz io t+""f ry I iq \eD ccn /|\ I nnelevl onJ ee cs"'"A
Physics 221Fall2007 ExamI 5. An object's acceleration is shown below. Theobject starts at rest at x - 0 and / : 0. What is the object's position at time t:3.0 s? '(Al+.s m BJ 9.0 m C) 12.5 m D ) 1 5 m E ) 2 5 m a* (m/sz) ^--(l o )r CI.i .1r t / l J l I I I I I r (s) ) ry T down t r * \ f - : ' . L + \ " d t = o + 1 + J o J o rE r' b" ) < : X e - + l , f d t - r O + - J o . , r ' 6 How long doesthe mass, initially at rest at the top of the frictionless,inclined plane shown below? f N t-Ti f b t'f< i l l * l 5.0 d t = L j_ 2_ 6. xF.on) i the incline, take to slide * V.5 nn 5.00 m t " nnssl q0 ^'- ?KlnQ = 562*lru A) 0.84 s B) l.0l s C) 1.11 s D) 1.33 s ftrD.47 s cs-,-b., t, ocreler:fiar "l% i*o\-LR'a- G h:! dA/r\-a-ff- c6\€/eC d = 5'q) m = 6' lcn ss)?f 1-?- . iA .t t qt- -- F \i a' Y I 2 d--

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Phvsics 221Fall2007 Exam I 7 . Two balls are shot toward eachother at the same time, t : 0 s, off of two identical tablesthatare l00m apart. Letbatl#l hitthegroundatttandball #zhittheground att2. If the initial velocity of ball #1 is (Z.O tdr)iandthe initial velocity of ball #2is (-+.0 tdr)i , what is the ratio of tftz?
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exam1_2007f_sol - ExamI Physics 221,FaLt2007 1 A book is at...

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