College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Question
Chapter 9, Problem 37P
To determine
To find: The angular speed of the skater when her arms and one leg outward.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
A ring (2 kg, r = 1 m) rotates in a CW direction with initial angular velocity 10 s-1. A disk (4 kg, r = 1 m) rotates in a CCW direction with initial angular velocity 40 s-1. The ring and disk "collide" and eventually rotate together. Assume that positive angular momentum and angular velocity values correspond to rotation in the CCW direction.What is the initial angular momentum Li of the ring+disk system? kg m2 s-1
What is the final angular velocity ωf of the ring+disk system? s-1
Ice skaters often end their performances with spin turns, where they spin very fast about their center of mass with their arms folded in and legs together. Upon ending, their arms extend outward, proclaiming their finish. Not quite as noticeably, one leg goes out as well. Suppose that the moment of inertia of a skater with arms out and one leg extended is 3.2 kg ⋅ m2 and for arms and legs in is 0.80 kg ⋅ m2. If she starts out spinning at 5.0 rev/s, what is her angular speed (in rev/s) when her arms and one leg open outward?
Three solid, uniform boxes are aligned as in the figure below. Find the x- and y-coordinates (in m) of the center of mass of the three boxes,
measured from the bottom left corner of box A. (Consider the three-box system.)
HINT
X
cm
y em
||
=
Origin
E E
m
0.360 m
A
0.750 kg
0.420 m
B
1.00 kg
0.240 m
с
0.650 kg
0.410 m
X
Chapter 9 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 9 - Rank in order, from largest to smallest, the...Ch. 9 - Starting from rest, object 1 is subject to a 12 N...Ch. 9 - A 0.2 kg plastic cart and a 20 kg lead cart can...Ch. 9 - Two pucks, of mass m and 4m, lie on a frictionless...Ch. 9 - Prob. 5CQCh. 9 - Two students stand at rest, facing each other on...Ch. 9 - A 2 kg cart rolling to the right at 3 m/s runs...Ch. 9 - Automobiles are designed with crumple zones...Ch. 9 - You probably know that it feels better to catch a...Ch. 9 - In the early days of rocketry, some people claimed...
Ch. 9 - Two ice skaters, Megan and Jason, push off from...Ch. 9 - Suppose a rubber ball and a steel ball collide....Ch. 9 - While standing still on a basketball court, you...Ch. 9 - To win a prize at the county fair, youre trying to...Ch. 9 - Rank in order, from largest to smallest, the...Ch. 9 - Monica stands at the edge of a circular platform...Ch. 9 - If the earth warms significantly, the polar ice...Ch. 9 - The disks shown in Figure Qg.181 have equal mass....Ch. 9 - Curling is a sport played with 20 kg stones that...Ch. 9 - Two balls are hung from cords. The first ball, of...Ch. 9 - Figure Q9.21 shows two blocks sliding on a...Ch. 9 - Two friends are sitting in a stationary canoe. At...Ch. 9 - Two blocks, with masses m1, = 2.5 kg and m2 = 14...Ch. 9 - A small puck is sliding to the right with...Ch. 9 - A red ball, initially at rest, is simultaneously...Ch. 9 - A 4.0-m-diameter playground merry-go-round, with a...Ch. 9 - A disk rotates freely on a vertical axis with an...Ch. 9 - At what speed do a bicycle and its rider, with a...Ch. 9 - A 57 g tennis ball is served at 45 m/s. If the...Ch. 9 - A student throws a 120 g snowball at 7.5 m/s at...Ch. 9 - In Figure P9.4, what value of Fmax gives an...Ch. 9 - A sled and rider, gliding over horizontal,...Ch. 9 - Use the impulse-momentum theorem to find how long...Ch. 9 - a. A 2.0 kg object is moving to the right with a...Ch. 9 - A 60 g tennis ball with an initial speed of 32 m/s...Ch. 9 - A child is sliding on a sled at 1.5 m/s to the...Ch. 9 - An ice hockey puck slides along the ice at 12 m/s....Ch. 9 - As part of a safety investigation, two 1400 kg...Ch. 9 - In a Little League baseball game, the 145 g ball...Ch. 9 - A small, 100 g cart is moving at 1.20 m/s on a...Ch. 9 - A man standing on very slick ice fires a rifle...Ch. 9 - A 2.7 kg block of wood sits on a frictionless...Ch. 9 - A strong man is compressing a lightweight spring...Ch. 9 - A 10,000 kg railroad car is rolling at 2.00 m/s...Ch. 9 - A 5000 kg t rain car, with its top open, is...Ch. 9 - A 55 kg hunter, standing on frictionless ice,...Ch. 9 - A 9.5 kg dog takes a nap in a canoe and wakes up...Ch. 9 - Prob. 21PCh. 9 - A 71 kg baseball player jumps straight up to catch...Ch. 9 - A kid at the junior high cafeteria wants to propel...Ch. 9 - The parking brake on a 2000 kg Cadillac has...Ch. 9 - A 2.0 kg block slides along a frictionless surface...Ch. 9 - Erica (36 kg) and Danny (47 kg) are bouncing on a...Ch. 9 - At a wild-west show, a marksman fires a bullet at...Ch. 9 - A 20 g ball of clay traveling east at 3.0 m/s...Ch. 9 - Two particles collide and bounce apart. Figure...Ch. 9 - A 20 g ball of clay traveling east at 2.0 m/s...Ch. 9 - A firecracker in a coconut blows the coconut into...Ch. 9 - What is the angular momentum of the moon around...Ch. 9 - A little girl is going on the merry-go-round for...Ch. 9 - What is the angular momentum about the axle of the...Ch. 9 - What is the angular momentum about the axle of the...Ch. 9 - Divers change their body position in midair while...Ch. 9 - Prob. 37PCh. 9 - What is the impulse on a 3.0 kg particle that...Ch. 9 - A 600 g air-track glider collides with a spring at...Ch. 9 - Far in space, where gravity is negligible, a 425...Ch. 9 - A 200 g ball is dropped from a height of 2.0 m,...Ch. 9 - A 200 g ball is dropped from a height of 2.0 m and...Ch. 9 - Figure P9.43 is a graph of the force exerted by...Ch. 9 - A sled slides along a horizontal surface for which...Ch. 9 - A 140 g baseball is moving horizontally to the...Ch. 9 - Squids rely on jet propulsion, a versatile...Ch. 9 - The flowers of the bunchberry plant open with...Ch. 9 - a. With what speed are pollen grains ejected from...Ch. 9 - A tennis player swings her 1000 g racket with a...Ch. 9 - A 20 g ball of clay is thrown horizontally at 30...Ch. 9 - Dan is gliding on his skateboard at 4.0 m/s. He...Ch. 9 - James and Sarah stand on a stationary cart with...Ch. 9 - Ethan, whose mass is 80 kg, stands at one end of a...Ch. 9 - A small cart rolls freely along the floor. As it...Ch. 9 - Three identical train cars, coupled together, are...Ch. 9 - A 110 kg linebacker running at 2.0 m/s and an 82...Ch. 9 - Most geologists believe that the dinosaurs became...Ch. 9 - Two ice skaters, with masses of 75 kg and 55 kg,...Ch. 9 - Prob. 59GPCh. 9 - One billiard ball is shot east at 2.00 m/s. A...Ch. 9 - A 10 g bullet is fired into a 10 kg wood block...Ch. 9 - A typical raindrop is much more massive than a...Ch. 9 - A 15 g bullet is fired at 610 m/s into a 4.0 kg...Ch. 9 - Two 500 g blocks of wood are 2.0 m apart on a...Ch. 9 - A 495 kg cannon fires a 10.0 kg cannonball with a...Ch. 9 - Laura, whose mass is 35 kg, jumps horizontally off...Ch. 9 - A spaceship of mass 2.0 106 kg is cruising at a...Ch. 9 - At the county fair, Chris throws a 0.15 kg...Ch. 9 - Figure P9.70 shows a collision between three balls...Ch. 9 - The carbon isotope 14C is used for carbon dating...Ch. 9 - A 1.0-m-long massless rod is pivoted at one end...Ch. 9 - A 200 g puck revolves in a circle on a...Ch. 9 - Figure P9.74 shows a 100 g puck revolving at 100...Ch. 9 - A 2.0 kg, 20-cm-diameter turntable rotates at 100...Ch. 9 - Joey, from Example 9.10, stands at rest at the...Ch. 9 - A 3.0-m-diameter merry-go-round with a mass of 250...Ch. 9 - Disk A, with a mass of 2.0 kg and a radius of 40...Ch. 9 - Consider a golf club hitting a golf ball. To a...Ch. 9 - Consider a golf club hitting a golf ball. To a...Ch. 9 - Consider a golf club hitting a golf ball. To a...Ch. 9 - Consider a golf club hitting a golf ball. To a...
Knowledge Booster
Similar questions
- A 2.5 kg wooden block hangs from the end of a 1.4 kg, 1.0 m long iron rod that swings from a frictionless hinge at the top end of the rod. A 12 g bullet is shot horizontally into the block where it sticks, causing the pendulum system to swing out to a 33° angle. What was the speed of the bullet? The moment of ML2 3 where M is the mass and Lis inertia of the iron rod is the length of the rod. O 367 332 436 458 8 S m S m Sarrow_forwardTwo ice skaters, with masses of 50 kg and 75 kg, are at the center of a 60-m-diameter circular rink. The skaters push off against each other and glide to opposite edges of the rink. If the heavier skater reaches the edge in 20 s, how long does the lighter skater take to reach the edge?arrow_forwardDisk A, with a mass of 2.0 kg and a radius of 40 cm, rotates clockwise about a frictionless vertical axle at 30 rev/s. Disk B, also 2.0 kg but with a radius of 20 cm, rotates counterclockwise about that same axle, but at a greater height than disk A, at 30 rev/s. Disk B slides down the axle until it lands on top of disk A, after which they rotate together. After the collision, what is their common angular speed (in rev/s) and in which direction do they rotate?arrow_forward
- ! 9. A mass m₁ = 19.0 kg is connected by a light string that passes over a pulley of mass M = 13.0 kg to a mass m₂ = with the horizontal (see figure). There is no 6.00 kg sliding on an inclined frictionless surface that makes an angle of 24° slippage between the string and the pulley. What is the magnitude of the moment of inertia of the pulley is 1/2Mr².) m/s² Q 2 W S X ommand 28 # 3 E D C C $ A t 4 R F (1332 1332 1332 jj1332.jj13.24 V ar s % G Search or type URL 5 T G A 6 B m₂ 8 MacBook Pro Y H & N 7 jil332 eration of the system of masses? (The N m. U J 00 * 8 3 - jj1332 jj133 jj1332 jj1332 1 ← ( 9 K H 32.jj1332 jj1332 jj1332 < * O < I ) O 32 jjl332 jjl3 L command P л. 4 - : ; option M { [ + 11 21 ? = 11 e A -arrow_forwardLily is a 50 kg diver. At the instant of takeoff, her angular momentum about her longitudinal axis is 20 kgm2/s. Her radius of gyration about the longitudinal axis is 0.4 m at this instant. During the dive, Lily tucks and reduces her radius of gyration about the longitudinal axis to 0.2 m. At takeoff, what is Lily’s moment of inertia about her longitudinal axis? At takeoff, what is Lily’s angular velocity about her longitudinal axis? After Lily tucks, what is her moment of inertia about her longitudinal axis? After Lily tucks, what is her angular velocity about her longitudinal axis?arrow_forwardThree solid, uniform boxes are aligned as in the figure below. Find the x- and y-coordinates (in m) of the center of mass of the three boxes, measured from the bottom left corner of box A. (Consider the three-box system.) X HINT cm Y cm = Origin Need Help? E E m Read It 0.300 m A 0.750 kg Watch It 0.350 m B 1.00 kg 0.150 m с 0.650 kg 0.418 marrow_forward
- A cue ball travelling at 0.785 m/s [270°] strikes a stationary five-ball, causing it to move at 0.601 m/s [230°]. The cue ball and the five-ball each have a mass of 160 g. What will be the velocity of the cue ball immediately after impact? Ignore frictional and rotational effects.arrow_forwardThree solid, uniform boxes are aligned as in the figure below. Find the x- and y-coordinates (in m) of the center of mass of the three boxes, measured from the bottom left corner of box A. (Consider the three- box system.) HINT 0.360 m 0.420 m 0.240 m A B 0.418 m Origin 0.750 kg 1.00 kg 0.550 kg X cm m = Ycm = m Need Help? Read It Watch Itarrow_forwardA meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 20 cm mark and the other at the 30 cm mark, you hold the meter stick in a horizontal, stationary position. Given the force at the 20 cm mark is 2 N, find the mass of the meter stick.arrow_forward
- Three solid, uniform boxes are aligned as in the figure below. Find the x- and y-coordinates (in m) of the center of mass of the three boxes, measured from the bottom left corner of box A. (Consider the three-box system.) HINT 0.250 m 0.400 m 0.150 m A B C 0.418 m Origin 0.900 kg 1.00 kg 0.650 kg Xcm m Y cmarrow_forwardA 500 gram meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 20 cm mark and the other at the 70 cm mark, you hold the meter stick in a horizontal, stationary position. Find the forces your fingers place on the meter stick. Four point masses, m1 = 1 kg, m2 = 2 kg, m3 = 3 kg and m4 = 4 kg are on the x axis as shown in the figure below. Find the moment of inertia of the above system about an axis of rotation that is perpendicular to the page and passes through x = 0 m. Find the moment of inertia of the above system about an axis of rotation that is perpendicular to the page and passes through x = 4 m.arrow_forwardConsider a stick of mass, M = 14.0 kg and length, L = 1.60 m hanging vertically initially. A bullet of mass, m = 0.040 kg and speed, v = 70 m/s strikes and embeds itself at the bottom end of the stick. Magnitude of acceleration due to gravity is g = 10 m/s². Note: The moment of inertia of a rod about it's center of mass 1 = ML². You may need to use the parallel axis theorem. Closeup Part B: @max M What is the maximum angle, Omax achieved by the stick (with the bullet embedded in it)? Incorrect 2.17⁰ Correct: 6.97⁰ Incorrect 83° Incorrect 9.87⁰ Incorrect None of the abovearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
University Physics (14th Edition)
Physics
ISBN:9780133969290
Author:Hugh D. Young, Roger A. Freedman
Publisher:PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:9781107189638
Author:Griffiths, David J., Schroeter, Darrell F.
Publisher:Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:9780321820464
Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...
Physics
ISBN:9780134609034
Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:PEARSON