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Midterm

PHYS 100 University of Rochester P100 2009S Exam 1 SolutionssExam


Department
Physics
Course Code
PHY 100
Professor
All
Study Guide
Midterm

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P100 University of Rochester NAME _________________________________________
S. Manly Spring 2009
Exam 1 (March 2, 2009)
Please read the problems carefully and answer them in the space provided. Write on
the back of the page, if necessary. Show your work where requested in order to be
considered for partial credit. In problems where you are requested to show your work,
no credit will be given unless your work is shown.
Problem 1 (4 pts, no need to show work):
In a vacuum, the speed of x-rays compared to the speed of visible light is
a) very much greater.
b) very much less.
c) the same
d) a little less.
e) a little greater
f) not a reasonable thing to ask for since neither x-rays or visible light can traverse a vacuum.
Problem 2 (4 pts, no need to show work):
Jethro and Biff are facing each other at the exact center of a frozen circular pond. Jethro weighs twice what
Biff weighs. Biff shoves Jethro toward the edge of the pond. Assume the surface of the pond is perfectly
frictionless.
a) Jethro slides to the edge of the pond and Biff stays in the center.
b) Biff slides to the edge of the pond and Jethro stays in the center.
c) Neither boy moves.
d) Jethro and Biff slide to the edge of the pond and Biff reaches the edge first.
e) Jethro and Biff slide to the edge of the pond and Jeff reaches the edge first.
f) Jethro and Biff slide to the edge of the pond and reach the edge at the same time.
Problem 3 (4 pts, no need to show work):
NASA‟s satellites stay aloft because
a) they move so fast that they are able to fall‟ around the earth.
b) they are far from Earth so that there is no gravitational force on them.
c) they have rocket engines that provide a force that holds them aloft.
d) there is no air resistance in outer space and thus no downward force on an orbiting satellite.
Problem 4 (4 pts, no need to show work):
Two wave pulses are sent down a rope in opposite directions. As shown in the sketch, wave A has a height
of 1 cm and wave B is 2 cm in depth. When the waves meet, they will create
a) a disturbance 3 cm high.
b) a disturbance 1 cm high.
c) a disturbance 3 cm deep.
d) a disturbance 1 cm deep.
e) no disturbance because they cancel.
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P100 University of Rochester NAME _________________________________________
S. Manly Spring 2009
Problem 5 (4 pts, no need to show work):
If you were to travel near lightspeed and measure your own mass, pulse-rate and size, you would notice
that
a) your mass has increased.
b) your pulse has slowed.
c) your body has shortened along the direction of travel.
d) all of the above.
e) none of the above.
Problem 6 (4 pts, no need to show work):
If you were on the moon, you would find that
a) Both your weight and mass would be increased
b) Both your weight and mass would be reduced
c) Your weight would be reduced, but not your mass.
d) Your mass would be reduced, but not your weight.
Problem 7 (7 pts, no need to show work):
Calculate the photon energy for light with a wavelength in vacuum of 500 nm ( =500x10-9 meters).
Problem 8 (7 pts, no need to show work):
A car moving at 48 meters per second brakes to a stop in 6 seconds. What is the average acceleration of the
car?
Problem 9 (6 pts, no need to show work):
List two things that provide scientific evidence that light is a wave phenomenon.
Scores
1. ___/4
2. ___/4
3. ___/4
4. ___/4
5. ___/4
6. ___/4
7. ___/7
8. ___/7
9. ___/6
10. ___/14
11. ___/12
12. ___/18
13. ___/12
Total
___/100
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