The Medical College - Page 63
56.
D.
All three statements made are not
addressed
by the passage.
57.
A.
Paragraph four mentions that a nasty set
of
rumors hinted that Hoover's relief efforts
competed
with the Red Cross; in this paragraph both
Roo-
sevelt's and Churchill's oppositions are
mentioned.
The National Committee on Food for the
Small
Democracies was a propaganda organization.
Para-
graph four points out that Hoover acted quickly
to
aid with money, food, and other such
supplies.
58.
D.
There can be no doubt in the reader's
mind
that Hoover was service oriented, had a
long
record, and was committed. No sides were
taken
by the author, and in that respect a fair and
sym-
pathetic job was done.
59.
D.
The opening paragraph states the
computer
model was developed by the
U.S.E.P.A.
60.
C.
Paragraph two states that the primary
differ-
ence was the loss on ignition.
61.
C.
Paragraph six states that the coal
contributed
3.71/3.86 or 96.1% of the total
ash.
62.
D.
Magnesium oxide was added in the
hypo-
thetical sample to increase resistivity as
indicated
in paragraph six.
63.
A.
Paragraph one states that two ash
samples
were received September 1989 and two ash
sam-
ples were received November 1989.
64.
A.
Paragraph six indicates that
magnesium
oxide increased resistivity, whereas sodium
oxide
lowers resistivity.
65.
C.
The laboratory work and the computer
mod-
eling work was done to predict the effects of
a
change in chemical composition of a waste fuel
on
the electrical resistance of the ash
produced.
PHYSICAL SCIENCES
66.
C.
The tangential (linear) velocity of an
object
moving around a circular path (velocity
tangent
to the circle) is proportional to the angular
veloc-
ity.
v = r w, where r is the radius (9 m in this
case)
and w is the angular velocity (which must be
in
radians/sec for use in this
formula).
67.
D.
A "g" force is equal to the actual weight,
mg,
of a person or object, so:
8 "g's" = 8(82 kg)(9.8 m/sec
2) = 6429
N.
68.
D.
The centrifugal force is the "equal and
oppo-
site force" of Newton's third law and thus
does
NOT act on the pilot. It is the force that the
pilot
exerts on the back of his seat.
69.
A.
Power in watts is the rate of energy use,
thus
the energy, E = P
t or E = 450 watts
120 sec
= 54,000 joules and liters of
O2 consumed
=
54,000 J/(20,000 J/L) = 2.7 L.
70.
D.
According to Newton's third law, the
pilot
exerts a force of 8 "g's" on his seat back.
Notice that
this is the centrifugal force and it is a real
outward
force on the seat back. (The pilot, in his
rotating
"frame of reference," feels as if a large
outward
force is pushing him into the seat back. This
force is
a "fictitous" force because the only real force
acting
on him is the inward centripetal
force.)
71.
D.
The necessary inward-pointing
centripetal
force is unchanged. Nothing has changed
except
the device that supplies the centripetal
force.
72.
B.
It is given in the passage that the
telescope
length is approximately equal to the sum of
the
focal lengths. If the total length is 4 m, then
the
value of fe
is 4 m – fo
= 1 m.
73.
B.
The objective lens forms a real,
inverted
image. The eyepiece acts in the same way that
a
magnifying glass does. The observer looks
through
the eyepiece and sees a final, virtual image
that has
the same orientation as the first image (that
is, the
final image is still inverted). This can be
corrected
by inserting a third lens, known as an erecting
lens,
between the objective and
eyepiece.
74.
C.
The magnification of a simple
Newtonian
telescope is the ratio of the objective focal
length
to the eyepiece focal length:
M = fo/fe
= 3/1 = 3
.
75.
B.
This question requires an understanding
of
total internal reflection. The critical angle
is the
incident angle for which Snell's law of
refraction
predicts a refracted angle of 90°, for
light rays
traveling from a medium of larger index
of
refraction toward a medium of lower index
of
refraction. Here the light ray is incident
inside the
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