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PHYS Straighterline exam with correct answers 2024
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  • PHYS Straighterline

An amusement park game consists of throwing a quarter into a small bowl. If you win, you get to take home a giant purple stuffed elephant. The dish is on a shelf that is 0.4 m above the point where the quarter leaves your hand. The horizontal distance between the bowl and the place where the quarte...

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  • November 6, 2024
  • 22
  • 2024/2025
  • Exam (elaborations)
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PHYS Straighterline

An amusement park game consists of throwing a quarter into a small bowl.
If you win,
you get to take home a giant purple stuffed elephant. The dish is on a shelf
that is 0.4 m
above the point where the quarter leaves your hand. The horizontal
distance between
the bowl and the place where the quarter leaves your hand is 1.8 m. Ignoring
air drag, if
If
youthetoss
x-component
the quarterofata an
vector is of
angle 3 and
60°,the y-component
what is 4,iswhat
initial velocity is the
needed to
magnitude
the vector?
bring home the ofcorrect
answers
giant purple5 stuffed elephant? correct answers
Which
4.8 m /ofs the following is involved in uniform circular motion? correct
answers constant
angular
velocity
As shown, a crate of oranges and a crate of apples, each with a different
mass, areby a rope (with tension Toa). A second rope (To ) is attached to
attached
the crate and
oranges, of the entire system is pulled with a constant acceleration a
by this of
Which rope.
the following is true of the tensions? correct answers
Toa > To
How can you calculate the magnitude of a vector using scalar
products?Multiply
answers correctit by itself and take the
square root.
Suppose you weigh an object and the reading you get from the scale is
0.0070significant
many kg. How digits does your measurement have? correct
answers Two
Consider two objects sliding down an incline without rolling. If the objects
don't have
same mass,the the heavier object will accelerate at a faster rate than the
lighter one.
correct answers
false
Which of the following statements concerning friction between the
surfacesisofcorrect?
objects two correct answers The force of friction mostly depends on
thethe
of nature
two
surfaces.
Calculate x=vt+1/2at2, where v = 0.227 m/s. t = 11.1s, and a = 9.80
m/s2. correct
answers 606
m
Which of the following statements concerning friction is incorrect? correct
answers
force of static
The friction ( fs ) between parallel surfaces in contact is given
by: fs = μsN.
A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4
s. Which
the of is the average acceleration of the car? correct answers
following
0.5 m / s2

,If the cross product of a vector of length 5 and a vector of length 3 results in
a vector
length of what is the angle between them? correct
10,
answers 42°
A vector is quantity that requires both magnitude and . correct
answers
directio
n
King Kong is holding a woman on top of a skyscraper when she suddenly
slipshand.
his out of How tall is the building if Superman has a minimum time of 2.30 s
to catchbefore
woman the she hits the ground? correct answers
25.9 m
Kylie throws Kyra a kiwi. The kiwi leaves Kylie's hand at a height of 1.3
m from and
ground the Kyra grabs it out of the air at a height of 1.6 m. Kylie throws
the kiwi
angle of at
33°anrelative to the horizontal. The kiwi is in the air for 1.1 s. How
far apart
Kylie and areKyra standing? (Assume there is no drag force that no wind is
blowing.)
correct answers 9.6
m
A projectile is launched from a height of 250 m with initial horizontal
velocity
What of 50
is the m/s.
horizontal range of the projectile? correct
answers 357 m
Imagine that you push down on an object that is sitting on a frictionless
table.
the Which of
following diagrams includes all the forces acting on the object? correct
answers
W down, FN
up
Your cat chases a spider across the floor. Its position is a function of
time is r ++ (0.7m + (0.5m/s2)t2)j, where the origin is the southwest corner
(1.2m/s)ti
of the
Find thefloor.
average speed of the cat between t = 0.0s and t = 4.0s correct
answers
m/ 2.3
s
The position of an object along the x-axis is described by the formula x
= 3t 2 of
Which − 2t.
the following are the correct formulas for the velocity and
acceleration
object? of the
correct answers v = 6t −
2, a = 6
Using the conversion factor between kilograms and pounds, 1 kg = 2.205
lb, calculate
how many pounds are in 2.00 kg. correct answers
4.41 lb
An experimental new ride at an amusement park begins by spinning
patrons
circle of about
radiusaR with constant speed v. At some point during the ride
the speed
doubles and the spokes extend, doubling the radius. After this occurs,
what is the of the patrons in terms of the original acceleration, a ? correct
acceleration
answers 2a
Consider a mass of 85kg lying on the ground. The coefficient of static
friction
them is between
us = 0.65. What is the minimum force you need to apply in order
to slide correct
mass? the answers
541 N

, When turning around a circle, a car is subject to a continuous force, but its
speed
not does
necessarily change. Why is this true? correct answers The speed is not
changing,
but the direction
is.
A small mass is placed on a turntable that is rotating at 45 rpm. The
centripetal
acceleration is . correct answers greater when the mass is
farther
the centerfrom of the
circle
How many significant figures are in the
quantity
9.86 m/s 2? correct
answers 3
Laura is listening to a record spinning at 45 rpm (revolutions per minute).
When shethe speed selector on the record player to 33 rpm, it takes 2.7
switches
seconds
record for the
player to change to the new speed. How many revolutions does the
record make
during this time? Assume that the angular acceleration of the record is
constant. correct
answers
1.8
A 309 g glass rolls down an incline and onto a horizontal platform
where it hits
beverage canathat is laying at rest on its side. The top of the incline is 11.0
cm above
the horizontal platform. The beverage can is initially at rest and weighs 7.35
N. Which is
following of the final velocity of the glass? correct answers
−0.612 m / s
This hourglass-shaped object is hung from a pivot point (round dot). Its
center
is marked of gravity
by a cross. If the object is free to rotate, what does it do? correct
answers
does not It
move.
You are sparring in karate class. Your opponent, standing directly in front of
you,
a punch throwsstraight into your chest. What stance will best allow you to take
this punch
without losing your balance? correct answers left
forward
A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal
steel slab.
collision The elastic in that the ball rebounds to its original height. If
appears
the collision
lasts for 2.00 × 10−3 s, which of the following is the impulse imparted to the
ball and the
average force applied to the ball during the collision? correct answers I =
8.85
F kg•m
= 4.43 ×/ s
103 N
A spaceship is in space and currently at rest. The directive is given to
accelerate
rest to a speed fromof 2.90 &times 103 m / s. If the fuel budgeted for this
action of
which is 400 kg,
the following is velocity of the exhaust gas required if the ship
mass is 103
&times 7.38kg? correct answers -5.5 × 104
[m / s]
A boat pulls a water skier who weighs 127 lbs at a constant speed. The
tension
ski rope in is the
125 N. The skier makes a run that is 0.7 km down a long straight
is the What
river. work done by the water skier on the boat? correct answers −8.75 ×
104 N • m

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