Physics A Exam 4 - November 14/15, 2001, Exams of Physics

The rules, conversion factors, and problems for a physics a exam 4 held on november 14/15, 2001. The exam includes five problems, with a total of 83 points, covering topics such as forces, work, energy, and motion. The exam also provides conversion factors for various units, such as miles to feet, hours to minutes, and pounds to kilograms.

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

koofers-user-rju
koofers-user-rju 🇺🇸

10 documents

1 / 5

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Physics A Exam 4 12/02/20
PHYSICS A
EXAM 4
November 14/15, 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 (30 points)
PROBLEM 2 (5 points)
PROBLEM 3 (18 points)
PROBLEM 4 (18 points)
PROBLEM 5 (12 points)
TOTAL (83 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 4 - November 14/15, 2001 and more Exams Physics in PDF only on Docsity!

PHYSICS A

EXAM 4

November 14/15, 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 (30 points) PROBLEM 2 (5 points) PROBLEM 3 (18 points) PROBLEM 4 (18 points) PROBLEM 5 (12 points) TOTAL (83 max) PERCENTAGE OUT OF 80

Solve the problems you think are easiest first.

  1. Two window washers are standing on a scaffold supported by two ropes. The length of the scaffold is 10.0m. The painter on the left is standing 3.0m from the rope on the left. The painter on the right is standing 4.0m from rope on the right. Both painters have a mass of 75 kg. The mass of the scaffold is 25kg. a. Draw a free body diagram indicating all the forces acting on the scaffold (5 points). Ans see instructor b. Calculate the tension in the ropes by summing the forces in the y-direction and the torques about an appropriate pivot point. (25 points) Ans 780N & 930N

Ans 14m/s

  1. Two young drivers are competing in an illegal drag race on a Sacramento road. One car starts from rest and completes the race in 10.97 seconds. The car was clocked at 46.0m/s by a police officer as it crossed the finish line. The 925kg vehicle used an average thrust of 7500N to complete the race. a. What is the average acceleration of the vehicle? (5 points) Ans 4.19m/s^2 b. What is the net force that produced this acceleration? (4 points) Ans 3880N c. What is the work done by the net force?(8 points) Ans 9.79x10^5 J

Name:___________________

5. A 17-kg box of goodies is pulled up a frictionless hill. The angle of the hill with respect to the horizontal is 12.0º. The applied force is parallel to the direction of its displacement. Draw a picture for your benefit. Keep your final answers to 2 significant figures! a. How much work is done by gravity if the sled is pushed a distance of 25.2-m? (5 points) Ans –870J b. Calculate the magnitude of the force acting on the box of goodies if the velocity of the box is constant over the 25.2-m distance it travels? What is the concept that must be applied to solve this problem? (8 points) Ans 34N