PHYS Straighterline Review Questions
and Answers, Rated A+
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? - Ans-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? - Ans-
5
Which of the following is involved in uniform circular motion? - Ans-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? - AnsToa > To
How can you calculate the magnitude of a vector using scalar products? - Ans-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? - Ans-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. - Ans-false
Which of the following statements concerning friction between the surfaces of two objects is correct? -
Ans-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. - Ans-606 m
,Which of the following statements concerning friction is incorrect? - Ans-The force of static 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 of the following is
the average acceleration of the car? - Ans-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? - Ans-42°
A vector is quantity that requires both magnitude and ________. - Ans-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? -
Ans-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.) - Ans-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? - Ans-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? - Ans-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 - Ans-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? - Ans-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. - Ans-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 ? - Ans-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? - Ans-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? - Ans-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
____________. - Ans-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? - Ans-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. - Ans-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? - Ans-−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? - Ans-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? - Ansleft
forward
and Answers, Rated A+
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? - Ans-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? - Ans-
5
Which of the following is involved in uniform circular motion? - Ans-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? - AnsToa > To
How can you calculate the magnitude of a vector using scalar products? - Ans-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? - Ans-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. - Ans-false
Which of the following statements concerning friction between the surfaces of two objects is correct? -
Ans-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. - Ans-606 m
,Which of the following statements concerning friction is incorrect? - Ans-The force of static 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 of the following is
the average acceleration of the car? - Ans-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? - Ans-42°
A vector is quantity that requires both magnitude and ________. - Ans-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? -
Ans-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.) - Ans-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? - Ans-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? - Ans-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 - Ans-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? - Ans-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. - Ans-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 ? - Ans-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? - Ans-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? - Ans-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
____________. - Ans-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? - Ans-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. - Ans-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? - Ans-−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? - Ans-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? - Ansleft
forward
