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@~@,a.,Sample Physics Exam Test
{Laws of Motion 1 - 5 5
{Field Concepts 6 - 10 5
{The Theory of Relativity 11 - 15 5
[CATEGORY 4 000 - 000
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~,M,d,1,1
What is the magnitude of the force that produces an acceleration
of 3.2 cm/sec² in a mass of 5 gm?
a. 13 dynes
b. 96 dynes
c. 16 ergs
d. 16 dynes
~,E,1,1,2
183 cm/sec
A mass of 12 gms on the end of a thread is being whirled around
in a circle of radius 2 . If the thread breaks when the force on
it is 2000 dynes, what is the maximum speed the mass can have?
(Ignore Gravity).
~,E,1,1,3
3.7e+27 dynes
What is the gravitational force exerted by the sun on the earth?
~,E,1,1,4
1 m/sec²
A body of mass 5 Kg is subject to horizontal forces of 3 newtons
pointed due east and also 4 newtons pointed due north. What is
the magnitude and and direction of the acceleration?
~,M,b,1,5
A mass of 3 kg is acted on by a force of 25 newtons. If it starts
from rest, how far will it travel after 5 sec ?
a. 10.4 cm
b. 104 meters
c. 1040 cm
d. 360 meters
~,M,a,2,6
An electron has a velocity of 1.5e+8 cm/sec vertically upward.
What are the magnitude and direction of the magnetic field which
it produces at a point 1.0e-6 cm due north of itself.
a. 2.4 gauss
b. 24 gauss
c. 2.4 dynes
d. 140 ergs
~,E,1,2,7
5.57e-5 qauss, horizontal, toward the south.
What are the magnitude and direction of a magnetic field which
could support the weight of an electron with a horizontal
velocity of 1.0 cm/sec due east.
~,E,3,2,8
5.26e-8 cm/sec
4.8e-19 gm cm/sec
79 volts
An electron moves in a circular orbit of radius 1.5 m in a
magnetic field of 0.2 gauss. Find (a) its velocity, (b) its
momentum, (c) its energy in volts.
~,M,b,2,9
A charge of 3.5 Statcoulomb has a horizontal velocity of 2.5e+7
cm/sec toward the northeast. What are the magnitude and direction
of the magnetic field at a point 3 cm due west of the charge.
a. .230 qauss vertically downward
b. 2.3e-4 gauss vertically upward
c. .230 gauss vertically upward
d. 2.3e-4 gauss vertically downward
~,M,a,2,10
An electron has a horizontal velocity of 3e+8 cm/sec toward the
southeast in a horizontal magnetic field of 10,000 gauss pointing
due north. What is the magnitude and direction of the magnetic
force on it?
a. 3.4e-8 dyne vertically downward.
b. 3.4e-8 dyne vertically upward.
c. 3.5e+8 dyne vertically downward.
d. 3.4e+8 dyne vertically upward.
~,M,b,3,11
A wrist watch keeps perfect time on earth. If it is worn by the
pilot of a space ship leaving the earth with a constant velocity
of 1.0e+9 cm/sec, how many seconds does it appear to lose in one
day from the point of view of an observer remaining behind on the
earth?
a. 48 minutes.
b. 48 secs.
c. 48 hours.
d. none of the above
~,M,a,3,12
When at rest a box is a cube with a side of length 25 cm. What is
the apparent volume when it moves with a velocity of 2e+10 cm/sec
parallel to one of its sides?
a. 5.36e+3 cubic inches.
b. 1.17e+4 cubic inches.
c. 3.24e+4 cubic cm.
d. 1.17e+4 cubic cm.
~,M,a,3,13
The dwarf companion of the star Sirius has a mass of 1.7e+33 gms.
The lines in its spectrum show a gravitational red shift of 1
part in 1e+4. Calculate its density.
a. 2.0e+5 qm/cubic cm.
b. 2.0e+5 kgm/cubic cm.
c. 4.0e+5 gm/cubic cm.
d. 4.0e+5 kgm/cubic cm.
~,E,1,3,14
The rates of the 2 clocks differ by only 1.55 parts in 1e+39.
The radius of a proton is about 0.8e-13 cm. Compare the rate of a
clock at the surface of a proton with a similar clock at
infinity.
~,M,b,3,15
In an experiment on the gravitional red shift using the Mossbauer
effect, one nucleus is at the top of the Empire State Building
and the other is at street level. The height of the building is
317 meters. The τ-rays emmitted by the lower nucleus have a
frequency of 3.47e+18 hz. What is the difference in frequency
between the τ-rays emmitted by the two nuclei.
a. 3.4e+4 Hz.
b. 1.2e+5 Hz.
c. 6.5e+4 Hz.
d. 1.5e+5 Hz.