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Unsolved Midterm Exam - General Physics | PHYS 0002B, Exams of Physics

Sierra CollegePhysics

Material Type: Exam; Class: General Physics; Subject: Physics; University: Sierra College; Term: Fall 2001;

Typology: Exams

Pre 2010

Uploaded on 07/31/2009

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Physics 2B 11/30/20
PHYSICS 2B
Two Combined Old Exams
September 12, 2001
Name:____________________SSN:_____________
Rules for Exam:
1. You are allowed one 3"x5" sheet of handwritten crib notes. You MUST turn in
your crib notes.
2. Calculators are allowed, but you may not share one.
3. Show your work on numerical problems. Do not expect any credit for a problem
if I cannot logically follow what you have put on your paper.
4. Make sure you include units with each answer. One point will be deducted for
each infraction.
5. Points will be deducted for students that refuse to turn in their exams, when
asked to do so (at the end of class).
6. In general you will not be penalized for incorrect sig. figs. However, one point
will be deducted for each answer that has a ridiculous amount of significant
figures. For example, a final answer quoted as 2.239389479 m/s is ridiculous.
7. Circle your final answers.
There are 5 pages to this exam. Put your name on all pages of the
exam.
Good Luck!
________________________________________________________
Conversion Factors and Constants:
1 mile= 5280 feet (exact) 1 day= 24 hours (exact)
1 inch= 2.54 cm (exact) 1 hour=60 minutes (exact)
1 cm= 10 mm (exact) micro (=10-6
1 eV=1.602x10-19J
Magnitude of the charge on the electron and proton 1.602x10-19 C
k 8.99x109N-m2/C2
Permittivity of free space 8.85x10-12 C2/ N-m2
Acceleration due to gravity =9.80m/s2= 32.2 ft/s2 downward
PART 1 (14 points)
PROBLEM 1 (20 points)
PROBLEM 2 (8 points)
PROBLEM 3 (10 points)
TOTAL (62 max)
PERCENTAGE (out of
60)
1
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pf4
pf5
pf8
pf9
pfa

Partial preview of the text

Download Unsolved Midterm Exam - General Physics | PHYS 0002B and more Exams Physics in PDF only on Docsity!

PHYSICS 2B

Two Combined Old Exams

September 12, 2001

Name:____________________SSN:_____________

Rules for Exam:

1. You are allowed one 3"x5" sheet of handwritten crib notes. You MUST turn in

your crib notes.

2. Calculators are allowed, but you may not share one.

3. Show your work on numerical problems. Do not expect any credit for a problem

if I cannot logically follow what you have put on your paper.

4. Make sure you include units with each answer. One point will be deducted for

each infraction.

5. Points will be deducted for students that refuse to turn in their exams, when

asked to do so (at the end of class).

6. In general you will not be penalized for incorrect sig. figs. However, one point

will be deducted for each answer that has a ridiculous amount of significant

figures. For example, a final answer quoted as 2.239389479 m/s is ridiculous.

7. Circle your final answers.

There are 5 pages to this exam. Put your name on all pages of the

exam.

Good Luck!

________________________________________________________

Conversion Factors and Constants: 1 mile= 5280 feet (exact) 1 day= 24 hours (exact) 1 inch= 2.54 cm (exact) 1 hour=60 minutes (exact) 1 cm= 10 mm (exact) micro (=10- 1 eV=1.602x10-19J Magnitude of the charge on the electron and proton 1.602x10-19^ C k 8.99x10^9 N-m^2 /C^2 Permittivity of free space 8.85x10-12^ C^2 / N-m^2 Acceleration due to gravity =9.80m/s^2 = 32.2 ft/s^2 downward PART 1 (14 points) PROBLEM 1 (20 points) PROBLEM 2 (8 points) PROBLEM 3 (10 points) TOTAL (62 max) PERCENTAGE (out of 60)

Name:_____________________________________________

Fill in the blank, short answer, and multiple choice. (2 points each, unless

otherwise noted).

  1. There is a hollow, conducting, uncharged sphere with a negative charge inside the sphere. Consider the electrical potential at the inner and outer surfaces of the sphere A. the potential on the inner surface is greater. B. the potential on the outer surface is greater. C. The potentials on both surfaces are zero. D. The potentials on both surfaces are equal but not zero. - Q The figure below shows four parallel plate capacitors: A, B, C, and D. Each capacitor carries the same charge q and has the same plate area A. As suggested by the figure, the plates of capacitors A and C are separated by a distance d while a distance 2d separates those of B and D. Capacitors A and B are maintained in vacuum while capacitors C and D contain dielectrics with constant k = 5.
  2. Which capacitor has the largest potential difference between its plates? A. A B. B C. C D. D E. A and D are the same and larger than B or C.
  3. Which one of the following statements best explains why tiny bits of paper are attracted to a charged rubber rod? A. Paper is naturally a positive material. B. Paper is naturally a negative material. C. The paper becomes polarized by induction. D. Rubber and paper always attract each other. E. The paper acquires a net positive charge by induction.
  4. The number of electric field lines passing through a unit of surface area is indicative of the: A. field direction B. potential C. strength of the electric field D. charge motion

Name:_____________________________________________

Problems

  1. Consider the arrangement of charges in the above diagram. a. On the diagram above, sketch the direction of the electric field vectors at the point P due to each of the two charges. Which direction will the resultant electric field point? (4 points) b. What is the magnitude and direction of the total electric field at the point P (12 points)? 1.4x10^6 N/C in –y-dir c. What is the force (magnitude and direction) on a -10.0C test charge placed at P ( points)? 144N in +y-dir 9.0 cm 9.0 cm 12.0 cm

-3.0  C

+3.0  C

P

Name:_____________________________________________

  1. What is the electric potential energy of the above three charges? (8 points) -0.45J
  2. Pacemakers use capacitors to control the timing of voltage pulses that are delivered to a malfunctioning heart to regulate its timing (beat cycle). A pacemaker utilizes two capacitors with capacitances of 1.0 and 0.5 F that are connected in parallel. If these capacitors are charged to 6.0 volts, calculate the charge and energy stored in the 1.0 F capacitor ( points)? 1.8x10-5J

Name:____________________

Problems

Each of the following problems is worth 15 points. Do three of the following four problems.

If you attempt all the problems, CLEARLY indicate the three you want graded.

Otherwise, the first three solved problems will be graded. You are not allowed to change your choice after turning in your exam.

  1. Four resistors and a 6.0-V battery are arranged as shown in the circuit diagram. Calculate the current flowing through the 30  resistor (15 points). 0.13A
  1. A battery with a 12-V EMF has a terminal voltage of 11.4 V when it delivers 20A to the starter of a car. a. Draw a schematic diagram of the circuit including the battery, the internal resistance of the battery, and the starter. Include a voltmeter in the circuit that measures the voltage across the starter and an ammeter that measures the total current in the circuit. (6 points) b. Calculate the internal resistance of the battery. (6 points) 0.03 ohms c. How much energy is dissipated per unit time by internal resistor. This is heat energy developed in the battery per unit time. (3 points) 12W
  1. Consider the RC circuit in the below. d. What is the time constant for the circuit? (2 points) 0.040s e. Assume the switch is closed at t=0 s. When is the charge on the capacitor equal to one half its maximum value? What is the current in the circuit at this time? (13 points)? 0.00060A V=12.0 Volts 1.0x10^4  4.0x10-6F