Physics A Exam 5, Exams of Physics

The rules, conversion factors, and problems for a physics a exam 5. The exam includes five problems related to physics, such as calculating the buoyant force, mechanical advantage, total force, internal resistance of a battery, and resistance in a circuit. The exam also specifies the points for each problem and the total points for the exam.

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

koofers-user-n6b-2
koofers-user-n6b-2 🇺🇸

8 documents

1 / 5

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Physics A Exam 5 11/28/20
PHYSICS A
EXAM 5
December 6/7, 2001
Name:___________________
Rules for Exam:
1. Crib sheet will be provided by instructor.
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. Follow the rules for significant figures. One point will be deducted for every
two infractions.
5. Make sure you include units with each answer. One point will be deducted
for each infraction.
6. Points will be deducted for students that refuse to turn in their exams, when
asked to do so (at the end of class).
7. Circle your final answers.
________________________________________________________
Conversion Factors:
1 mile= 5280 feet (exact) 1 day= 24 hours (exact)
1 km =0.6214 miles 1 year=365.25 days
1 inch= 2.54 cm (exact) 1 hour=60 minutes (exact)
1 gallon =3.785 liters=231 in31 km=1000 meters (exact)
1 slug=14.59 kg 1 foot= 12 inches
1 mile= 1609.3 m 1 parsec=3.26 light-years
1 meter=39.37 inches 1lb=0.454kg
1 cm=0.01meters=10 mm (exact) 1ft=30.48cm
1 minute= 60 seconds (exact)
SCORE
PROBLEM 1 (15 points)
PROBLEM 2 (9 points)
PROBLEM 3 (15 points)
PROBLEM 4 (17 points)
PROBLEM 5 (24 points)
TOTAL (80 max)
PERCENTAGE OUT OF 80
Solve the problems you think are easiest first.
1
pf3
pf4
pf5

Partial preview of the text

Download Physics A Exam 5 and more Exams Physics in PDF only on Docsity!

PHYSICS A

EXAM 5

December 6/7, 2001

Name:___________________

Rules for Exam:

1. Crib sheet will be provided by instructor.

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. Follow the rules for significant figures. One point will be deducted for every

two infractions.

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

for each infraction.

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

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

7. Circle your final answers.

________________________________________________________

Conversion Factors: 1 mile= 5280 feet (exact) 1 day= 24 hours (exact) 1 km =0.6214 miles 1 year=365.25 days 1 inch= 2.54 cm (exact) 1 hour=60 minutes (exact) 1 gallon =3.785 liters=231 in^3 1 km=1000 meters (exact) 1 slug=14.59 kg 1 foot= 12 inches 1 mile= 1609.3 m 1 parsec=3.26 light-years 1 meter=39.37 inches 1lb=0.454kg 1 cm=0.01meters=10 mm (exact) 1ft=30.48cm 1 minute= 60 seconds (exact) SCORE PROBLEM 1 (15 points) PROBLEM 2 (9 points) PROBLEM 3 (15 points) PROBLEM 4 (17 points) PROBLEM 5 (24 points) TOTAL (80 max) PERCENTAGE OUT OF 80

Solve the problems you think are easiest first.

  1. An object is weighed in air and in ethyl alcohol. Its mass in air is 0.1030 kg. Its mass in ethanol is 0.0957kg. The density of ethyl alcohol is =0.806x10^3 kg/m^3. a Assuming a string suspends the object when it is immersed in the fluid, draw a free-body diagram indicating the forces acting on the object. Calculate the buoyant force acting on the object when it is immersed in the fluid (7 points). Ans 0.072N b Calculate the volume of fluid displaced (6 points). Ans 9.0x10-6m^3 c Calculate the mass density of the object (4 points). Ans 11x10^3 kg/m^3

Name:___________________

  1. Your headlights will dim if you leave them on while you start your car. The voltage your battery will deliver with a load is reduced because of the internal resistance. The terminal voltage of a particular automobile battery drops from 12 V to 9V while the starter is drawing 350A of current. a. Calculate the internal resistance of the battery. (5 points) Ans 0.008ohms
  2. Calculate the amount of charge and the number of electrons delivered by the battery, if the ignition key is turned for 2.1s (6 points). Ans 730C
  3. Calculate the energy delivered by the battery in 2.1s (4 points). Ans 8.8x10^3 J

Starter 9.0V

across it

with 350A

5. Four resistors and a 24-V battery are arranged as shown in the circuit diagram. Watch your significant figures! a. Calculate the total resistance of the circuit. (10 points) Ans 96ohms b. Calculate the total current flowing through the circuit. (4 points) Ans 0.25A c. Calculate the current flowing through the 49 resistor, the voltage drop across the 49 resistor, and power dissipated by this resistor. (15 points) Ans .11A,0.61W, 5.6V