Unit 5 Practice Problems - Physics Honors Ch 10 Worksheet...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics Honors Ch. 10 Worksheet The propeller of an airplane has an initial angular velocity of 900 rad/s toward the east. After twenty seconds, the propeller has rotated 2500 times toward the east. 1) Assuming it was constant, what was the angular acceleration of the propeller? Answer: 11.4 rad/s 2 [W] 2) When is the propeller spinning at 450 rad/s [E]? Answer: t = 39.5 s A motor-powered wheel is spinning at 10 rad/s [U]. The motor output is increased so that the wheel rotates 18 times upward in a 4.0 s time period. 3) What is the angular displacement of the wheel as it speeds up? Answer: 1.13 x 10 2 rad [U] 4) What is the angular velocity of the wheel at the end of this process? Answer: 46.5 rad/s [U] 5) What was the angular acceleration of the wheel during this process? Answer: 9.14 rad/s 2 [U] The motor-powered wheel from the questions above is spinning at 3.0 rad/s [U] when the motor is reversed so that the angular acceleration is 10 rad/s 2 [D]. 6) If the radius of the wheel is 11 cm…. a) What is the magnitude of the tangential acceleration of the edge of the wheel? Answer: 1.10 m/s 2 b) What is the magnitude of the centripetal acceleration of the edge of the wheel? Answer: 0.99 m/s 2 c) What is the magnitude of the acceleration of the edge of the wheel? Answer: 1.48 m/s 2 7) What is the angular velocity of the wheel 1.0 s after the motor is reversed? Answer: 7.00 rad/s [D] 8) What is the upward angular displacement of the wheel as it comes to a stop before beginning to rotate downward? Answer: 0.45 rad [U] A fan is rotating at 20.0 rad/s [N] when it begins to constantly accelerate to a final angular velocity of 10.0 m/s [N]. It rotates through 1.50 x 10 2 rad during this time. 9) How long did the angular acceleration last? Answer: 10.0 s 10) What was the average angular acceleration of the fan during this time? Answer: 1.00 rad/s 2 [S] A long, thin rod of mass m = 1 kg, length L = 1.2 m, and moment of inertia I = 0.16 kg m 2 rotates around a frictionless axis near its base (located at the intersection of the thin lines), as shown at right. The axis is located one-third of the distance from one end of the rod to the other. The rod is released from rest at the position shown, with = 30 . Gravity causes it to rotate.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
11) Relative to the axis of rotation, where is the center of mass of the rod? Answer: 20 cm from the axis 12) What torque acts on the rod? Answer: 0.98 N · m [into the page] 13) What is the initial angular acceleration of the rod?
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern