First Exam PHSX L1.L, Spring 2005
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MULTIPLE CHOICE. Choosethe one alternativethat best completesthe statementor answersthe question.
L) Scienceis a body of knowledge that
A) is an ongoing activity of humans.
B) condensesknowledge into testablelaws.
C) describesorder in nature.
of the abovechoicesare correct.
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E) None of the abovedroices are correct.
2) Whidl of the following is a scientifichypothesis,accordingto the text'sworking definition?
A) There are parts of the Universe we will never know about.
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( B)tthere is no life on Mars.
C) There are things we will never know about.
D) Matter is filled with undetectableparticles.
E) None of the above.
3) What item or items were stolen in a fratemity house Feynmanwas in?
A) Beerkeg
B) Group pictures of the fraternity
C) All slide rules
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( D))A,door
E) English literature texts
4) A scientific statementthat can never be changedis a scientific
A) law.
B) theory.
C) principle.
D) hvpothesis.
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(E) None of the abovechoicesare correct.
5). As-an
, 4 obiectfreely falls downward near the Earth, its
(3)iPneea increases
B) accelerationincreases.
C) inertia decreases
D) all of the above
E) none of the above
6) Whirl a rock at the end of a string on a frictionlessice-coveredpond and it follows a circular path. If the string
breaks,the tendencyof the rock is to
A) stop moving
B) continue to follow a circular path.
( CDfollow a straight line path
D) all of the above
E) none of the above
7) The gain in speedeachsecondfor a freely-falling (no air resistance)objectis about
A) 0.
^
\p)10m/s,
C) 20m/s.
D) 5 m/s.
E) dependson the initial speed
8) A truck is moving at constantvelocity. Inside the storagecompartrnent,a rock is dropped from the midpoint of
the ceiling and strikesthe floor below. The rock hits the floor
A) behind the midpoint of the ceiling.
of the midpoint of the ceiling.
Aahead
below the midpoint of the ceiling.
(!)xactly
D) More information is neededto solve this problem.
E) none of these
9) A moving body must undergo a changein
A) direction.
B) distance.
C) velocity.
D) acceleration
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10) When a rocket ship acceleratingin outer spaceruns out of fuel it
A) acceleratesfor a short time, slows down, and eventually stops.
B) stopssuddenly
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( C) ho longeraccelerates.
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D) acceleratesfor a short time, then slows down to a constantvelocity.
E) continuesto accelerateuntil somethingstopsit
11) Which of the following is not a vector quantity?
A) acceleration
@)sp"ea
\d
velocity
D) displacement
E) all are vector quantities
L2) A qarmaintains a constantvelocity of L00km/hr for 10 seconds,During this interval its accelerationis
D) 10 km/hr-s
E) 10km/hr.
C) 110km/hr.
B) 1000km/hr.
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13) The muzzlevelocity of a bullet fired from a new rifle is 100m/s. Neglecting air resistance,at the end of one
seconda bullet fired straight up into the air will lave traveled a distanceof
A) 105m.
B) 100m.
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D) 5 m.
E) noneof these
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L4) A man leansover the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance,two seconds
later the rock's speedis
A) zero'
B ) 5m / s .
(C)/s m/s.
D) 10m/s.
E) none of the above.
L5) One half secondafter starting from rest,a freely-falling objectwill have
A) 20m/s.
B) 10m/s.
C) 2.5m/s.
of about
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m/s.
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E) noneof these
L5) if one objecthas twice as much massas anotherobject,it alsohas twice as much
A) velocitv.
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f B)./nertia.
C) accelerationdue to gravity.
D) volume.
E) all of these
17) A 10-N falling object encounters 4 N of air resi{ce.
A)4N.
B)oN.
The net force on the object is
(9bN.
D)10N.
E )1 4 N
18) The maximum accelerationof a car while towing a secondcar twice its mass,comparedto its accelerationwith
no car in tow, is
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third.
B) one half.
C) one fourth.
D) the same.
E) none of these
19) An objectfalls freely from rest on a planet where the accelerationdue to gravity is twice asmuch as it is on
Earth.In the fust 5 secondsit falls a distanceof
A) 500m.
B) 150m.
C) 100m.
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E) noneof these
20) Disregarding air drag, how fast must you tossa ball straight up in order for it to take 2 secondsto return to the
Ievel from which you tossedit?
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B) 20m/s
D ) 1 5m / s
E)5 m/s
A) 7.5m/s
( C ) 1 0m / s
2L) Ten secondsafter starting from rest,a car is moving at 40 m / s. What is the car's accelerationin metersper
secondper second?
A) 400
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c) 0.2s
D) 40
E) 10
22) A 1000-kgautomobile entersa freeway on-ramp at 30 m/s and acceleratesuniformly up to 50 m/s in a time of
10 aeconds.How far doesthe automobiletravel during that time?
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B)200m
C)100m
D)300m
E)500m
23) A L0-kilogram block with an initial velocity of 10 m/s slides 10 metersacrossa horizontal surfaceand comesto
rest.It takesthe block 2
to stop.The stopping force acting on the block is about
fqnds
A) 10N.
c) s N.
D) 2sN.
E) none of these
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24) BEGINNiNG HERE ARE THE EXTRA CREDITQUESTIONS
An astronauton anotherplanet drops a L-kg rock from rest and finds that it falls a vertical distanceof 2.5
metersin one second.On this plane! the rock has a weight of
A)1N.
B)2N.
c)3N.
D)4N.
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25) Frank Wilczek used which of theseas an analogyfor the most fundamental nature of matter and energy aswe
know it today?
A) Treesin a forest
B) Pointlike particles
C) A miniature solar system.
P) Bricks in a building
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1E)Musical Vibrations
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26) Vvhichof the following was NOT a part of either of the replicasof medieval weapon the Trebouchetconstructed
for the NOVA special?
A) lead counterweights
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[B) ]igttt for aiming
C) a wooden axle allowing the arms to swing
D) wheels on the bottom
E) a counterweightmade of a wooden bucket filled with dirt or rocks
27) Anobject startsat rest and moveswith accelerationwhich INCREASESat 2 metersper secondper second,
every second.How far has it moved after 5 seconds?
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B )1 8 m
C)108m
D)35m
28) Chris Mooney describedwhidr is theseas the main problem with sciencejournalism?
A) Not enough attention to medical research
"balance"
f'B)Eoncentration on fringe views in an effort to provide
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tsf No views presentedother than thoseof mainstreamscientists
D) Too much emphasison space missions
E) Not enough accessto top secretreseardr
E)12m