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Physics A Exam 2: Problem Solutions, Exams of Physics

Sierra CollegePhysics

Solutions to problems from a physics a exam. It includes problems on calculating time differences, finding acceleration, drawing free-body diagrams, and more. Students preparing for a physics a exam can use this document as a reference.

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

koofers-user-1er
koofers-user-1er 🇺🇸

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Physics A Exam 2 11/30/20
PHYSICS A
EXAM 2
March 6,2000
Name:___________________SSN:______________
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 each
infraction.
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 mile= 1609.3 m 1 ft=12 inches
1 m=39.37 inches 1 cm= 10 mm (exact)
Acceleration due to gravity =9.80m/s2 downward=32.2 ft/s2
SCORE
PROBLEM 1 (22points)
PROBLEM 2 (14 points)
PROBLEM 3 (10 points)
PROBLEM 4 (20 points)
PROBLEM 5 (24 points)
TOTAL (90 max)
Percentage out of 86
points
Solve the problems you think are easiest first.
1
pf3
pf4
pf5

Partial preview of the text

Download Physics A Exam 2: Problem Solutions and more Exams Physics in PDF only on Docsity!

PHYSICS A

EXAM 2

March 6,

Name:___________________SSN:______________

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 each

infraction.

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 mile= 1609.3 m 1 ft=12 inches 1 m=39.37 inches 1 cm= 10 mm (exact)

Acceleration due to gravity =9.80m/s^2 downward=32.2 ft/s^2

SCORE

PROBLEM 1 (22points) PROBLEM 2 (14 points) PROBLEM 3 (10 points) PROBLEM 4 (20 points) PROBLEM 5 (24 points) TOTAL (90 max) Percentage out of 86 points

Solve the problems you think are easiest first.

Name:_____________________________________________

  1. Josh is standing on a platform that is 55 m above the ground. He throws a rock straight up with an initial speed of 13 m/s. At the instant he releases the rock, a ball drops out of his pocket. a. Find the time difference between when the rock hits the ground and when ball hits the ground. (15 points) Ans 1.6s b. What is the speed of the rock when it hits the ground? (7 points) Ans 35m/s
  2. Consider the system below. The 10.0N force only acts on the top object only. There is a frictional force between M 1 and M 2. There is no frictional force between M 2 and the table supporting M 2. Draw a separate free-body diagram for each object. You must indicate and label all forces acting on the objects. (14 points) Ans see instructor

M 1

F=10.0N

Ans 4.90s Name:_____________________________________________

  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 105 mph (154ft/s) by a police officer as it crossed the finish line. The 3150-lb vehicle used an average force of 2500 lbs to complete the race. a. What is the average acceleration of the vehicle? (5 points) Ans 14.0ft/s^2 b. Assuming the acceleration is constant, how far does it travel within 10.97 seconds ( points)? Ans 845ft c. How much unbalanced force produces this acceleration? Which law did you use for this calculation? (7 points) Ans 1.37x10^3 lb d. What is the frictional force opposed to this acceleration? (7 points)

Ans 1.1x10^3 lb