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Physics 2A Exam 4: Solutions and Problems, Exams of Physics

Sierra CollegePhysics

The rules, conversion factors, and problems for exam 4 of physics 2a. Students are required to fill in the blanks and solve numerical problems related to physics concepts such as torque, elastic collisions, impulse-momentum theorem, and more. The document also includes free body diagrams and calculations for various scenarios.

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

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Physics 2A Exam 4 11/28/20
PHYSICS 2A
EXAM 4
May 11, 2001
Name:___________________
Rules for Exam:
1. 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.
2. Make sure you include units with each answer. One point will be deducted for
each infraction.
3. Points will be deducted for students that refuse to turn in their exams, when
asked to do so (at the end of class).
4. 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.
5. Circle your final answers.
There are 5 pages to this exam. Put your name on all pages of the
exam. Good Luck!
________________________________________________________
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 m (exact)
1 cm= 10 mm (exact)
1 minute= 60 seconds (exact)
Acceleration due to gravity =9.80m/s2= 32.2 ft/s2 downward
SCORE
PART 1 (14 points)
PROBLEM 1 (15 points)
PROBLEM 2 (20 points)
PROBLEM 3 (13 points)
TOTAL (62 max)
PERCENTAGE (out of 60)
1
pf3
pf4
pf5

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Download Physics 2A Exam 4: Solutions and Problems and more Exams Physics in PDF only on Docsity!

PHYSICS 2A

EXAM 4

May 11, 2001

Name:___________________

Rules for Exam:

1. 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.

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

each infraction.

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

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

4. 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.

5. Circle your final answers.

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

exam. Good Luck!

________________________________________________________

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 m (exact) 1 cm= 10 mm (exact) 1 minute= 60 seconds (exact)

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

SCORE

PART 1 (14 points) PROBLEM 1 (15 points) PROBLEM 2 (20 points) PROBLEM 3 (13 points) TOTAL (62 max) PERCENTAGE (out of 60)

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

noted )

  1. Torque measures a. force times displacement b. the ability of a force to rotate an object c. the mass divided by the acceleration of the object d. an objects inertia

2. In an elastic collision,

a. kinetic energy is the only conserved quantity b. momentum is the only conserved quantity c. kinetic energy and momentum are conserved

  1. A stunt person jumps from a tall building onto a large inflated pad. One reason why the pad reduces the force of impact is because a. the interaction time is reduced b. the interaction time is increased c. the change in velocity is increased d. the change in velocity is decreased
  2. State the impulse momentum theorem in words. Do not write an equation.
  3. Of the nine planets in our solar system, the innermost is Mercury. When compared to the other planets in our solar system, Mercury has the: a. greatest centripetal acceleration b. greatest period of revolution c. smallest angular velocity d. smallest tangential velocity
  4. Which force is responsible for holding a car in a frictionless banked curve? a. the reaction force to the car's weight b. the vertical component of the car's weight c. the vertical component of the normal force d. the horizontal component of the car's weight e. the horizontal component of the normal force
  5. Which of the following is not one of Kepler's laws.

a. All planets move in elliptical orbits with the Sun at one focus.

b. The torque on a planet orbiting the Sun is zero.

c. For each orbiting planet T^2 =kr^3 , where T is the orbital period and r is the average distance

from the Sun.

d. A line drawn from the Sun to any planet sweeps out equal areas in equal time intervals.

**1. b

  1. c
  2. b
  3. Impulse delivered by a force on an object equals the change in momentum of the** **object.
  4. a
  5. e
  6. b**
  1. A 20.0kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole, as shown below. A cable at an angle of 30.0 degrees with the beam helps to support the light. a. Draw a free body diagram indicating all the force acting on the horizontal beam. Indicate all components of forces. (6 points) b. Calculate the tension in the cable. (6 points) 392N c. Calculate the vertical and horizontal forces exerted on the beam by the pole. (8 points) 339N and 0N 30. o

Name :_______________________

  1. An 18g bullet is fired upward into a 1.0 kg falling block. The block is traveling to the downward at 4.9 m/s. After the bullet in imbedded into the block, the block travels upward. The speed of the bullet is 735m/s a. Calculate the velocity of the bullet block system after the collision. (8 points) 8.2m/s b. How high does the bullet block system rise after the bullet in imbedded into the block? ( points) 3.4m bullet block