
(a)
The magnitude and the direction of the initial
(a)

Answer to Problem 4SP
The angular momentum of the system is
Explanation of Solution
Given info: The rotational velocity of the wheel is
Write the expression for the angular momentum.
Here,
Substitute
Conclusion:
Therefore, the angular momentum of the system is
(b)
The rotational velocity of the student and the stool about their axis after the wheel is flipped.
(b)

Answer to Problem 4SP
The rotational velocity of the student and the stool about their axis is
Explanation of Solution
The angular momentum gained by the student, stool, and wheel is exactly twice the original angular momentum of the wheel. The student can stop the rotation of the stool by flipping the wheel axis back to its original direction.
Write the expression for conservation of angular momentum.
Here,
Write the expression for the angular momentum of the wheel.
Here,
Substitute
Equating with the angular momentum of the wheel and the stool,
Write the expression for the angular momentum of the stool.
Here,
Substitute
Conclusion:
Therefore, the rotational velocity of the student and the stool about their axis is
(c)
Where will be the torque come from that accelerates the student and the stool.
(c)

Answer to Problem 4SP
The student exerts forces on the handles when he flips the wheel.
Explanation of Solution
The sum of the angular-momentum vector of the wheel about its axis of rotation and the angular-momentum vector of the student, stool, and wheel about the axis of rotation of the stool add to yield the original angular momentum. This will be true if the angular momentum gained by the student, stool, and wheel is exactly twice the original angular momentum of system.
The student will exert some forces on the handles to produce a torque on the wheel which then produces an equal and opposite torque on the student.
Conclusion:
Therefore, the student exerts forces on the handles when he flips the wheel.
Want to see more full solutions like this?
Chapter 8 Solutions
The Physics of Everyday Phenomena
- Don't use ai to answer I will report you answerarrow_forwardwhy did the expert subtract the force exerted by the hand and the elbow by the force due to the weight of the hand and forearm and force exerted by the tricep. Does the order matter and how do you determine what to put first. Question 4 AP, CHAPTER 13 FROM BASIC BIOMECHANICS 8TH EDITIONarrow_forwardThe drawing illustrates the dispersion of light by a prism. The prism is made from a certain type of glass, and has a cross section shaped like an equilateral triangle. The indices of refraction for the red and violet light in this type of glass are 1.649 and 1.694, respectively. The angle of incidence for both the red and violet light is 60.0°. Find the angles of refraction at which the (a) red and (b) violet rays emerge into the air from the prism. Glass prism Incident light Normal (a) Normal Incident light Red (660 nm) (b) Violet (410 nm)arrow_forward
- Don't use ai to answer I will report you answerarrow_forwardA glass block (n = 1.56) is immersed in a liquid. A ray of light within the glass hits a glass- liquid surface at a 70.0° angle of incidence. Some of the light enters the liquid. What is the smallest possible refractive index for the liquid?arrow_forwardThe drawing shows a crystalline slab (refractive index 1.995) with a rectangular cross section. A ray of light strikes the slab at an incident angle of 01 = 35.0°, enters the slab, and travels to point P. This slab is surrounded by a fluid with a refractive index n. What is the maximum value of n such that total internal reflection occurs at point P? Ме Buarrow_forward
- What is the amount of M112 needed to breach a 5-foot thick dense concrete wall utilizing an internal charge placed in the center of the target?arrow_forwardA small postage stamp is placed in front of a concave mirror (radius = 1.1 m), such that the image distance equals the object distance. (a) What is the object distance? (b) What is the magnification of the mirror (with the proper sign)?arrow_forwardCalculate the anti-clockwise torque and the clockwise torque of the system with the ruler and the washers. Record these values in Data Table 5. Ruler = 11.56 g, small washer = 1.85 g, large washer = 24.30 g. Calculate the % Difference in the Torques and record the values in Data Table 5. Is ΣAnticlockwise torque and Anticlockwise torque the same thing, are they solved in the same way?arrow_forward
- A window washer stands on a uniform plank of mass M = 142 kg and length l = 2.80 m supported by 2 ropes attached at the ends of the plank. The window washer has a mass m = 68.0 kg. What is the tension in each of the ropes, T1 and T2, if the window washer's displacement from the center of mass of the plank is x = 0.930 m as shown in Figure 1: Window Washer Problem?arrow_forwardA man holds a double-sided spherical mirror so that he is looking directly into its convex surface, 33 cm from his face. The magnification of the image of his face is +0.17. What will be the image distance when he reverses the mirror (looking into its concave surface), maintaining the same distance between the mirror and his face? Be sure to include the algebraic sign (+ or -) with your answer.arrow_forwardHow do you draw a diagram of the ruler and mass system in equilibrium identifying the anti-clockwise torque and clockwise torque? How do I calculate the anti-clockwise torque and the clockwise torque of the system with the ruler and the washers, does it come from the data in table 4? Please help, thank you!arrow_forward
- 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





