MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_01CB962E.F684C730" This document is a Single File Web Page, also known as a Web Archive file. If you are seeing this message, your browser or editor doesn't support Web Archive files. Please download a browser that supports Web Archive, such as Windows® Internet Explorer®. ------=_NextPart_01CB962E.F684C730 Content-Location: file:///C:/D9286902/Fall10.phys1112.exam3.SolutionWeb.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" TIME OF COMPLETION_______________

TIME OF COMPLETION_______________&n= bsp;          NAME___SO= LUTION__________________________

 

 

<= span style=3D'mso-bidi-font-size:10.0pt'> &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  DEPARTMENT OF NATURAL SCIENCES

 

PHYS 1112, Exam 3            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;       Section 1

Version 1            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;           Decem= ber 1, 2010

Total Weight: 100 points

 

1.     &nb= sp;   Check your examination for completeness prior to starting.  There are a total of nine (9) prob= lems on six (6) pages.

 

2.   =       Authorized references include your calculator with calculator handbook, and the Refere= nce Data Pamphlet (provided by your instructor).

 

3.     &nb= sp;   You will have 50 minutes to complete the examination.

 

4.     &nb= sp;   The total weight of the examination is 100 points.

 

5.     &nb= sp;   There are six (6) multiple choice and three (3) calculation problems. Work five (= 5) multiple choice problems and three (3) calculation problems. Show all work; partial credit will be given for correct work shown.

 

6.     &nb= sp;   If you have any questions during the examination, see your instructor who will=

be located in the classroom.

 

7.     &nb= sp;   Start:        &= nbsp;      11:00 a.m.

Stop:&n= bsp;            = ;   11:50 a.m.

 

 

 

 = ;             <= /span>PROBLEM

 

 = ;            &n= bsp;   POINTS

 

 = ;            &n= bsp;  CREDIT

 

     &nb= sp;            =    1-6

 

     &nb= sp;            =     25

 

 = ;

 

     &nb= sp;            =      7

 

     &nb= sp;            =     25

 

 = ;

 

8

 

     &nb= sp;            =     25

 

 = ;

 

     &nb= sp;            =      9

 

     &nb= sp;            =     25

 

 = ;

 

 = ;            &n= bsp;   TOTAL

 

 = ;            &n= bsp;       100

 

 

 

 

 

 = ;         PERCENTAGE

 

 

 

 

 

 

 

CIRCLE THE SINGLE BEST ANSWER FOR ALL MULTIPLE CHOICE QUESTIONS. IN MULTIPLE CHOICE QUESTIONS WHICH REQUIRE A CALCULATION SHOW WORK FOR PARTIAL CREDIT.

 

 

1. A layer of water (n =3D 1.333) floats on a container of carbon tetrachloride (n =3D= 1.42). What is the critical angle of the interface?

 

<= span style=3D'color:black'>a.       88o.<= o:p>

 

<= span style=3D'color:black'>b.      78o.<= o:p>

(5)

<= span style=3D'color:red'>c.       66o.

 

<= span style=3D'color:black'>d.      58o.<= o:p>

 

<= span style=3D'color:black'>e.       43o.<= o:p>

 

 

 

 

  1. A circular coil lies flat on a horizontal table.  A bar magnet is held above it= s center with its north pole pointing down.  The stationary magnet induces= (when viewed from above)

 

    1. No current in the coil.

 

    1. A clockwise current in the coil.

(5)

    1. A counterclockwise current in the coil.

 

    1. A current whose direction cannot be determined = from the information given.=

 

 

 

 

  1. A horizontal rod (oriented in the east-west direction) is moved northwar= d at constant velocity through a magnetic field that points straight down.<= span style=3D'mso-spacerun:yes'>  Make a statement concerning t= he potential induced across the rod.

 

    1. The west end of the rod is at higher potential than the east end.

 

    1. .

(5)

    1. .

 

 

 

 

 

4.   &n= bsp;  Which of the following is a correct statement= ?

a.&n= bsp;      A concave mirror always produces a real image= .

b.&n= bsp;     A convex mirror always produces a virtual image= .

c.&n= bsp;      A convex mirror always produces a real image.=

d.&n= bsp;     A concave mirror always produces a virtual im= age.

&= nbsp;

&= nbsp;

5.   &n= bsp;  Which of the following is correct for a convex mirror?

a.&n= bsp;      f =3D (= 1/4)R.

b.&n= bsp;     f =3D (= 1/2)R.

c.&n= bsp;      f= =3D - (= 1/2)R.

d.&n= bsp;     f =3D 2= R.

&= nbsp;

&= nbsp;

  1. .  A ray of light strikes the mi= rror perpendicular to the mirror. What is the angle of reflection?

 

    1.  0o.

 

    1. .

 

    1. .

 

    1. &nb= sp;

       

       

       

       

       

       

      1. A spherical concave s= having mirror has a radius of curvature of 25.0 cm.

       

       

      a. Where is the image = of a person’s face when it is 10.0 cm to the left from the mirror?

      f =3D R/2 =3D 12.5 cm

       

      p =3D 10.0 cm

       

      1/p + 1/q =3D 1/f

       

      1/q =3D 1/f – 1/p = =3D 1/(12.5 cm) – 1/(10.0 cm) =3D -1/(50.0 cm)

       

      q =3D -50.0 cm

       

       

      b. What is the magnification?        &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     

      M =3D -q/p =3D - (= -50.0 cm)/(10.0c m) =3D 5.00=

       

      cVirtual (q < 0)

       

      Upright (M > 0)

       

      Enlarged (|M| > 1)

       

      8.  Bar ab moves without friction on conducting rails as shown below. There is a uniform magnetic field with magnitude of 0.600 T directed into the plane of the page. You want to make = an exercise machine out of this apparatus, in which the person exercises by pushing the bar back and forth with an average speed of 4.00 m/s. What shou= ld be the circuit resistance if the person moving the bar is to do work at an average rate of 200 W?  <= /o:p>

       

      e =3D B V L =3D (0.600 T)(4.00 m/s)(3.00 m) =3D 7.20 V

       

      P =3D e2 /R

       

      R =3D e2 /P =3D 0.259= W

       

      9. Light traveling i= n air is incident on the surface of a block of plastic at an angle of 62.7o<= /sup> to the normal and is bent so that it makes a 48.1o angle with the normal in the plastic.

        1. What is the index of refraction of the plastic?

      n1 sin (q1) =3D n2 sin (<= span style=3D'font-family:Symbol'>q2)

      n2 =3D n1 sin (q1)/sin (q2) =3D 1.19

       

        1. Find the speed of light in the plastic.

       

      n =3D c/v

       

      v =3D c/n=3D(3.00 x 108 m/s)/1.19 =3D 2.51 x 108 m/s

       

       

       

       

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PHYS 1112 Exam 3, Version 1

Fall 2010        =             &nb= sp;            =             &nb= sp;            =             &nb= sp;    6

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