Time and Date Stamps (logged): 17:12:20 06-10-2020
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Precalculus II
General College Physics (Phy 201) Test 2
Completely document your work and your reasoning.
You will be graded on your documentation, your reasoning, and the
correctness of your conclusions.
Test should be printed using Internet Explorer. If
printed from different browser check to be sure test items have not been cut off. If
items are cut off then print in Landscape Mode (choose File, Print, click on Properties
and check the box next to Landscape, etc.).
Name and Signature of Student
_____________________________
Signed by Attendant, with Current Date and Time:
______________________
If picture ID has been matched with student and name as
given above, Attendant please sign here: _________
Instructions:
- Test is to be taken without reference to text or
outside notes.
- Graphing Calculator is allowed, as is blank paper or
testing center paper.
- No time limit but test is to be taken in one
sitting.
- Please place completed test in Dave Smith's folder,
OR mail to Dave Smith, Science and Engineering, Va. Highlands CC, Abingdon, Va.,
24212-0828 OR email copy of document to dsmith@vhcc.edu,
OR fax to 276-739-2590. Test must be returned by individual or agency supervising test. Test is not to be returned to student after it has been taken. Student may, if proctor deems it feasible, make and retain a copy of the test..
Directions for Student:
- Completely document your work.
- Numerical answers should be correct to 3 significant
figures. You may round off given numerical information to a precision consistent
with this standard.
- Undocumented and unjustified answers may be counted
wrong, and in the case of two-choice or limited-choice answers (e.g., true-false or
yes-no) will be counted wrong. Undocumented and unjustified answers, if wrong, never get
partial credit. So show your work and explain your reasoning.
- Due to a scanner malfunction and other errors some
test items may be hard to read, incomplete or even illegible. If this is judged by
the instructor to be the case you will not be penalized for these items, but if you
complete them and if they help your grade they will be counted. Therefore it is to
your advantage to attempt to complete them, if necessary sensibly filling in any
questionable parts.
- Please write on one side of paper only, and staple
test pages together.
Test Problems:
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Problem Number 1
A cart of mass 1.8 kg coasts 35 cm up an incline at 6 degrees with horizontal.
Assume that frictional and other nongravitational forces parallel to the incline
are negligible.
- What is the component of the cart's weight parallel to the incline?
- How much work does this force do as the cart rolls up the incline?
- Using the definition of kinetic energy determine the velocity of the cart after
coasting the 35 cm, assuming its initial velocity to be zero.
- Using the definition of kinetic energy determine the velocity of the cart after
coasting the 35 cm, assuming its initial velocity to be .22 m/s.
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Problem Number 2
An average force of 410 Newtons acts on a mass of 3.1 Kg for .05 seconds. Use
the Impulse-Momentum Theorem to determine the change in the object's velocity.
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Problem Number 3
A Ferris wheel with radius 21 meters is moving fast enough that at the top of
its arc a 150-lb person at the rim of the wheel has an apparent weight of only 99 pounds.
- How fast does a point on the rim of the wheel move?
- What will be the apparent weight of the same person at the bottom of the arc?
- What will be the apparent weight when the person is at the same height as the
center of the wheel?
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Problem Number 4
What would be the orbital KE of a satellite of mass 760 kg in circular orbit
about a planet of mass 38 * 10^24 kg, orbiting at a distance of 40900 km from the center of
the planet?
By how much would orbital PE change as the satellite moved from this orbit to a
circular orbit of radius 44990 km?
G = 6.67 * 10^-11 N m^2 / kg^2
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Problem Number 5
A disk of negligible mass and radius 8 cm is constrained to rotate on a frictionless
axis about its center. On the disk are mounted masses of 21 grams at a distance of 6.64 cm
from the center, 6 grams data distance of 3.68 cm from the center and 49 grams at a
distance of 1.6 cm from the center. A uniform force of .2993 Newtons is applied at the rim of
the disk in a direction tangent to the disk.
- What will be the angular acceleration of the disk?
- If the force is applied for 3 seconds with the disk initially at rest, what angular
velocity with the disk attain?
- What then will be the speed of each of the masses?
- What will be their total kinetic energy?
- Compare the total kinetic energy to the change in the quantity .5 I `omega^2.
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Problem Number 6
We wish to test whether the acceleration of an automobile on a constant
incline is constant.
- We allow it to roll down a such an incline from rest, starting at
different positions on the incline.
- If the automobile coasts distances of 5.004344, .6209865, 6.771529 and 2.932836 cm,
starting from rest each time, and requires respective times of 8.5 sec, 1 sec, 11.25
sec and 4.75 sec, is there evidence that acceleration is constant?