Download PHYSICS 111, First Exam, Fal12004 ID number MULTIPLE CHOICE

PHYSICS 111, First Exam, Fal12004
.
ID number
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following is a scientific statement?
~e
moon is made of green cheese.
"WThere are things we will never know about.
C) There are parts of the universe that will never be found by man.
D) Matter is filled with undetectable particles.
E) none of these
2) A scientific idea that is so well established that it cannot be questioned is
A) a law.
@.
impossibility
.
C) true of all really scientific ideas
D) a theory.
E) a hypothesis.
3) The gain in speed each second for a freely-falling object is about
A)O.
B) 5 mis.
@0
mi s.
0)20 mis.
E) depends on the initial speed.
4) If you are carrying a heavy bag of groceries and bang your hand against the wall, the concept that most
explains why you are hurt is
~
A) resistance
B) gravity
C) acceleration
~rtia
E) none of these
5) A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint
of the ceiling and strikes the floor below. The rock hits the floor
A) ahead of the midpoint of the ceiling.
~ehind
the midpoint of the ceiling.
l.9Jxactly
below the midpoint of the ceiling.
D) more information is needed to solve this problem.
E) none of these.
6) Galileo's use of inclined planes allowed him to effectively
A) increase the acceleration beyond that of free fall.
~liminate
'S"low
the acceleration of free fall.
down the acceleration of free fall.
D) all of these.
E) none of these.
1
~
7) ~h
of the following is not a vector quantity?
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B) velocity
C) acceleration
D) None are vector quantities.
.
E) All are vector quantities.
8~
the acceleration of a car that maintaffis a constant velocity of 100km/hr for 10 seconds?
~
B) 10 km/hr s
C) 10 m/hr s
D) 1000km/hr s
9) A hockey puck is set in motion acrossa frozen pond. If ice friction and air resistance are neglected, the force
required to keep the puck sliding at constant velocity is
A) the weight of the puck divided by the mass of the puck.
B) the mass of the puck multiplied by 9.8 meters per secondper second.
~qual
to the weight of the puck.
'i.£l/ero newtons.
E) none of these.
10) A car acceleratesfrom rest at 2 meters per secondper second. What is its speed 3 secondsafter the car starts
moving?
A)2m/s
B)3m/s
C)4m/s
~/S
E) none of these
11) A man leans over the edge of a cliff and throws a rock upward at 5 mi s. How far below the level from which it
was thrown is the rock 2~
later?
A)15m
12) ~
~
C)30m
D)20m
falls from a ledge and hits the ground 45 m below. The speed with whi~
(!:!;1
E)5m
it hits the ground is about
m / s.r--:-:-
B)60m/s.
\M
~
\\?0.'t(.:;:
'3""0
C) 120 m/ s.
D) more than 120 m/s.
E) 22.5 m/ s
13) One object has twice as much mass as another object. The first object also has twice as much
A) velocity.
B)volume.
@ertia.
D) gravitational acceleration.
E) all of these.
14) A ball is thrown upwards. Neglecting air resistance,what initial upward speed does the ball need to remain in
~ir
for a total time of 10 seconds?
~out
Som/s
B) about 60 m/s
C)about 80 m/s
2
D) about 100m/s
E) about 110m/s
15) The newton is a unit of
B) inertia.
A) density.
16) An object is pulled northward
E) mass.
C) acceleration
with a force of 10 N and southward wlm a rorce of 15 N. The magnitude of the
net force on the obje~
A)ON.
~
C)10N.
17) An apple weighs 1 N. The net force on the app~t
A)ON.
B)0.1N.
E) none of these.
D)15N.
is in free fall is
~
E) none of these.
D)9.8N.
18) Which has zero acceleration? An object
A) at rest.
B) in mechanical equilibrium.
C) moving at constant velocity.
~ll
of these.
E) none of these.
19) An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 meters
straight down in one second.
"
C)4.9
A)lN
D)5N
N
20) A falling skydiver of mass 100 kg experiences 500 N air resistance. The acceleration of the skydiver is
A) 0.2 g.
B) 0.3 g.
C) 0.4 g.
~
E) more than 0.5 g.
21) A tow truck exerts a force of 3000N on a car, accelerating it at 2 meters per second per second. What is the
massof the car?
A) 500 kg
8) 1000kg
~
~
D) 3000 kg
E) none of these
22) A IO-N block and a I-N block lie on a horizontal frictionless table. To push them with equal acceleration,we
would have to push with
100 times as much force on the heavier block.
8)1° times as much force on the heavier block.
block.
D) 1/10 as much force on the heavier block.
E) none of these.
3
~,r.~,.
.
23) What did Richard
Feynman
"fix by thinking"?
A) TV sets
B) doorbells
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