(b) By comparing the arc length between the two white lines to the distance covered by the BB, estimate the speed of the BB. Solution: Chapter 11 Rotational Dynamics and Static Equilibrium Q.123IP Suppose the child runs with a different initial speed, but that everything else in the system remains the same. Chapter 10 Homework Due: 10:00pm on Wednesday, April 16, 2014 You will receive no credit for items you complete after the assignment is due. What is the moment of inertia of the fan? The fan accelerates with constant angular acceleration for 15 s until it rthees its operating angularspeed of 1.9 rotations/s− after that its speed remains constant as long as the switch is “on.” The person stays in the room for a short time; then, 5.5 minutes after turning the fan on, she switches it off again and leaves the room. (b) Find the speed of the yo-yo after falling from rest through a height h = 0.50 m if the radius of the axle is 0.0075 m. Everything else in Active Example 10-3 remains the same. Magnetic Torque experiments include quantitative measurements of electromagnetism, magnetic and gravitational torque, simple harmonic motion, and precession along with an introduction to the concepts of gyromagnetic ratio, nuclear magnetic resonance and the Pulsed NMR spin-flip. Solution: When the hoop rolls on the ground without slipping, the energy possessed is the sum of its rotational kinetic energy and translational kinetic energy. 10. You may also enjoy taking a look at our Pulsed/CW NMR apparatus for more advanced experiments. A rotating wheel requires 3.00 s to rotate 37 revolutions. Solution: Chapter 10 Rotational Kinematics and Energy Q.100GP Solution: Chapter 10 Rotational Kinematics and Energy Q.101GP The rotor in a centrifuge has an initial angular speed of 430 rad/s. The moment of inertia of an object is a calculated measure for a rigid body that is undergoing rotational motion around a fixed axis: that is to say, it measures how difficult it would be to change an object's current rotational speed. Solution: Chapter 11 Rotational Dynamics and Static Equilibrium Q.97GP Solution: Chapter 11 Rotational Dynamics and Static Equilibrium Q.98GP You hold a uniform, 28-g pen horizontal with your thumb pushing down on one end and your index finger pushing upward 3.5 cm from, your thumb. Explain. CHAPTER 9: Rotation of Rigid Bodies EXAMPLE PROBLEM: The initial angular velocity of a bike wheel is 2.00 rad/s. Solution: Chapter 10 Rotational Kinematics and Energy Q.104GP A person walks into a room and switches on the ceiling fan. The Reynolds number is defined by Re = V d/ν.Here d is a characteristic size of the object (the diameter in the case of a spherical projectile) and ν is the kinematic viscosity of the medium. Class 17 Preclass Quiz on MasteringPhysics This was due this morning at 8:00am 84% of students got: A rotating object has some rotational kinetic energy. (b) What angularspeed must the CD have if its kinetic energy is to be doubled? Is the raw egg the one that spins a long time, or the one that stops spinning in a short time? Chapter 10 Rotational Kinematics and Energy Q.85GP Solution: Chapter 10 Rotational Kinematics and Energy Q.86GP Solution: Chapter 10 Rotational Kinematics and Energy Q.87GP Referring to the previous problem, (a) estimate the linear speed of a point on the rim of the rotating disk. Explain. b. his speed is great enough. Moment of Inertia and Center of Mass for Point Particles; Ball a, of mass , is connected to ball b, of mass , by a massless rod of length . (a) Is the moment of inertia of the new yo-yo greater than, less than, or the same as that of the original yo-yo? Hence, You meet your friend at . Board Examples: Rigid rod rotating about center or about end. CHAPTER 10: Dynamics of Rotational Motion EXAMPLE PROBLEM: A very light string is wrapped many times around a hollow wheel with a mass of 40.0 kg and a radius of 0.25 m. Explain. Solution: Chapter 11 Rotational Dynamics and Static Equilibrium Q.109GP Solution: Chapter 11 Rotational Dynamics and Static Equilibrium Q.110GP Solution: Chapter 11 Rotational Dynamics and Static Equilibrium Q.111GP In Problem, assume that the rod has a mass of M and that its bottom end simply rests on the floor, held in place by static friction. 9.6 – Moment of Inertia Calculations (Know Moment of Inertia for Common Rigid Bodies) Board Examples: Rigid rods, solid/hollow spheres/cylinders. Course Material Related to This Topic: Read lecture notes, pages 1–6; Read lecture notes, pages 4–19 (b) If the linear speed of the ball is doubled to 2v, does your answer to part (a) increase, decrease, or stay the same? ... Mastering Physics 10. 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