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PHYS Straighterline Exam (New Version June 2024)
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PHYS Straighterline Exam (New Version June 2024)
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PHYS Straighterline Exam (New Version June2024)
Which of the following statements concerning friction is incorrect? - ANSWER The
force of static friction ( fs ) between parallel surfaces in contact is given by: fs = μsN.
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 you toss the quarter at an angle of 60°, what initial velocity is
needed to bring home the giant purple stuffed elephant? - ANSWER 4.8 m / s
If the x-component of a vector is 3 and the y-component is 4, what is the magnitude
of the vector? - ANSWER 5
Which of the following is involved in uniform circular motion? - ANSWER constant
angular velocity
As shown, a crate of oranges and a crate of apples, each with a different mass, are
attached by a rope (with tension Toa). A second rope (To ) is attached to the crate of
oranges, and the entire system is pulled with a constant acceleration a by this rope.
Which of the following is true of the tensions? - ANSWER Toa > To
How can you calculate the magnitude of a vector using scalar products? -
ANSWER Multiply it by itself and take the square root.
Suppose you weigh an object and the reading you get from the scale is 0.0070 kg.
How many significant digits does your measurement have? - ANSWER Two
Consider two objects sliding down an incline without rolling. If the objects don't have
the same mass, the heavier object will accelerate at a faster rate than the lighter
one. - ANSWER false
Which of the following statements concerning friction between the surfaces of two
objects is correct? - ANSWER The force of friction mostly depends on the nature of
the two surfaces.
,Calculate x=vt+1/2at2, where v = 0.227 m/s. t = 11.1s, and a = 9.80 m/s2. -
ANSWER 606 m
A car travels with a speed of 3.5 m / s, and then accelerates to 5.5 m / s in 4 s.
Which of the following is the average acceleration of the car? - ANSWER 0.5 m /
s2
If the cross product of a vector of length 5 and a vector of length 3 results in a vector
of length 10, what is the angle between them? - ANSWER 42°
A vector is quantity that requires both magnitude and ________. - ANSWER
direction
King Kong is holding a woman on top of a skyscraper when she suddenly slips out of
his hand. How tall is the building if Superman has a minimum time of 2.30 s to catch
the woman before she hits the ground? - ANSWER 25.9 m
Kylie throws Kyra a kiwi. The kiwi leaves Kylie's hand at a height of 1.3 m from the
ground and Kyra grabs it out of the air at a height of 1.6 m. Kylie throws the kiwi at
an angle of 33° relative to the horizontal. The kiwi is in the air for 1.1 s. How far apart
are Kylie and Kyra standing? (Assume there is no drag force that no wind is
blowing.) - ANSWER 9.6 m
A projectile is launched from a height of 250 m with initial horizontal velocity of 50
m/s. What is the horizontal range of the projectile? - ANSWER 357 m
Imagine that you push down on an object that is sitting on a frictionless table. Which
of the following diagrams includes all the forces acting on the object? - ANSWER F
W down, N up
Your cat chases a spider across the floor. Its position is a function of time is r +
(1.2m/s)ti + (0.7m + (0.5m/s2)t2)j, where the origin is the southwest corner of the
floor. Find the average speed of the cat between t = 0.0s and t = 4.0s - ANSWER
2.3 m/s
The position of an object along the x-axis is described by the formula x = 3t 2 − 2t.
Which of the following are the correct formulas for the velocity and acceleration of
the object? - ANSWER 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. - ANSWER 4.41 lb
An experimental new ride at an amusement park begins by spinning patrons about a
circle of radius R 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
acceleration of the patrons in terms of the original acceleration, a ? - ANSWER 2a
Consider a mass of 85kg lying on the ground. The coefficient of static friction
between them is us = 0.65. What is the minimum force you need to apply in order to
slide the mass? - ANSWER 541 N
, When turning around a circle, a car is subject to a continuous force, but its speed
does not necessarily change. Why is this true? - ANSWER 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 ____________. - ANSWER greater when the mass is farther from
the center of the circle
How many significant figures are in the quantity
9.86 m/s 2? - ANSWER 3
Laura is listening to a record spinning at 45 rpm (revolutions per minute). When she
switches the speed selector on the record player to 33 rpm, it takes 2.7 seconds for
the record 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. - ANSWER 1.8
A 309 g glass rolls down an incline and onto a horizontal platform where it hits a
beverage can that 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 of following is the final velocity of the glass? - ANSWER −0.612 m / s
This hourglass-shaped object is hung from a pivot point (round dot). Its center of
gravity is marked by a cross. If the object is free to rotate, what does it do? -
ANSWER It does not move.
You are sparring in karate class. Your opponent, standing directly in front of you,
throws a punch straight into your chest. What stance will best allow you to take this
punch without losing your balance? - ANSWER left forward
A 0.500 kg steel ball is dropped from a height of 4.00 m onto a horizontal steel slab.
The collision appears elastic in that the ball rebounds to its original height. If 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? - ANSWER I =
8.85 kg•m / s
F = 4.43 × 103 N
A spaceship is in space and currently at rest. The directive is given to accelerate
from rest to a speed of 2.90 × 103 m / s. If the fuel budgeted for this action is
400 kg, which of the following is velocity of the exhaust gas required if the ship mass
is 7.38 × 103 kg? - ANSWER -5.5 × 104 [m / s]
A boat pulls a water skier who weighs 127 lbs at a constant speed. The tension in
the ski rope is 125 N. The skier makes a run that is 0.7 km down a long straight river.
What is the work done by the water skier on the boat? - ANSWER −8.75 × 104 N •
m
Which of the following is the general definition of impulse ? - ANSWER I = squiqqle
E Fdt
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