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Physics Homework Problems and iClicker Questions for PHYS 160-3H2 Class

Explore various physics homework problems and iClicker questions related to rotational motion, angular velocity, torque, and rotational inertia. Practice solving problems involving disc rotation, angular acceleration, and torque calculations. Enhance your understanding of angular physics concepts through practical examples and application scenarios. Stay engaged with the course material and prepare effectively for exams and assessments.

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Physics Homework Problems and iClicker Questions for PHYS 160-3H2 Class

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  1. PHYS 160-3H2 0830-0920 Thursdays Planetary Hall Room 220 Week 10 with Dr. Harold A. Geller Office: Planetary Hall Room 233

  2. Again, don’t forget the Again, don’t forget the webpage for this recitation webpage for this recitation http://physics.gmu.edu/~hgeller/PHYS160-3H2spring2024/

  3. Physics Homework Problem Physics Homework Problem Presentation Presentation

  4. iClicker Question • A disc has a radius of 5 cm. If the disc rotates about its central axis at an angular speed of 8 rev/s, what is the linear speed of a point on the rim of the disc? • A 0.4 m/s • B 2.5 m/s • C 3.9 m/s • D 50 m/s

  5. iClicker Question • A disc has a radius of 5 cm. If the disc rotates about its central axis at an angular speed of 8 rev/s, what is the linear speed of a point on the rim of the disc? • A 0.4 m/s • B 2.5 m/s • C 3.9 m/s • D 50 m/s

  6. iClicker Question • An object spins with an angular velocity w. If the object’s rotational inertia increases by a factor of 4, without the application of any external torque, what will be the object’s new angular velocity? • A w/4 • B w/2 • C 2w • D 4w

  7. iClicker Question • An object spins with an angular velocity w. If the object’s rotational inertia increases by a factor of 4, without the application of any external torque, what will be the object’s new angular velocity? • A w/4 • B w/2 • C 2w • D 4w

  8. iClicker Question • An object, initially at rest, begins spinning under a constant angular acceleration. In 15 s, it completes an angular displacement of 90 rad. What is the magnitude of the angular acceleration it experiences? • A 0.4 rad/s2 • B 0.8 rad/s2 • C 6 rad/s2 • D 12 rad/s2

  9. iClicker Question • An object, initially at rest, begins spinning under a constant angular acceleration. In 15 s, it completes an angular displacement of 90 rad. What is the magnitude of the angular acceleration it experiences? • A 0.4 rad/s2 • B 0.8 rad/s2 • C 6 rad/s2 • D 12 rad/s2

  10. iClicker Question • A wheel initially rotating at 12 rad/s decelerates uniformly to rest in 0.4 s. If the wheel has a rotational inertia of 0.5 kg*m2, what is the magnitude of the torque causing this deceleration? • A 1.5 N*m • B 15 N*m • C 30 N*m • D 38 N*m

  11. iClicker Question • A wheel initially rotating at 12 rad/s decelerates uniformly to rest in 0.4 s. If the wheel has a rotational inertia of 0.5 kg*m2, what is the magnitude of the torque causing this deceleration? • A 1.5 N*m • B 15 N*m • C 30 N*m • D 38 N*m

  12. iClicker Question • A grinding wheel with a radius of 12 cm is being used to sharpen a knife. The side of the knife is pressed perpendicularly into the wheel’s surface with a force of 16 N. The coefficient of kinetic friction between the knife and the wheel is 0.28. What is the torque the grinding wheel’s motor must supply to maintain its rotation rate of 50 rad/s? • A 5 N*m • B 0.72 N*m • C 4.5 N*m • D 0.54 N*m

  13. iClicker Question • A grinding wheel with a radius of 12 cm is being used to sharpen a knife. The side of the knife is pressed perpendicularly into the wheel’s surface with a force of 16 N. The coefficient of kinetic friction between the knife and the wheel is 0.28. What is the torque the grinding wheel’s motor must supply to maintain its rotation rate of 50 rad/s? • A 5 N*m • B 0.72 N*m • C 4.5 N*m • D 0.54 N*m

  14. iClicker Question • A child with a mass of 25 kg is standing at the edge of a 2 m radius merry-go-round, and they are rotating without friction at 20 rpm. The child then moves toward the center of the merry-go-round. The merry-go-round has a rotation inertia of 1200 kg*m2, and the rotational inertia of the child is I = mr2, where r is her distance from the axis of rotation. What is the new angular velocity when she is 0.5 m from the center of the merry-go-round? • A 2.03 rad/s • B 2.09 rad/s • C 2.15 rad/s • D 2.25 rad/s

  15. iClicker Question • A child with a mass of 25 kg is standing at the edge of a 2 m radius merry-go-round, and they are rotating without friction at 20 rpm. The child then moves toward the center of the merry-go-round. The merry-go-round has a rotation inertia of 1200 kg*m2, and the rotational inertia of the child is I = mr2, where r is her distance from the axis of rotation. What is the new angular velocity when she is 0.5 m from the center of the merry-go-round? • A 2.03 rad/s • B 2.09 rad/s • C 2.15 rad/s • D 2.25 rad/s

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