The angular position of a rod varies as 17.7t radians from time t = 0. The rod has two beads on it as shown in the following figure, one at r, = 15 cm from the rotation axis and the other at r, = 38 cm from the rotation axis. (Note: figure may not be drawn to scale.) Counterclockwise rotation Axis of rotation 15 cm 38 cm (a) What is the instantaneous angular velocity (in rad/s) of the rod at t = 9 s? (Indicate the direction with the sign of your answer. Round your answer to at least one decimal place.) rad/s (b) What is the angular acceleration (in rad/s²) of the rod att = 9 s? (Indicate the direction with the sign of your answer.) rad/s2 (c) What are the tangential speeds of the beads (in m/s) at t = 9 s? m/s Vt, 1- Vt 2 - m/s (d) What are the tangential accelerations of the beads at t = 9 s? (Enter the magnitudes in m/s².) |m/s² ", 1 = |m/s²

College Physics
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Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
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The angular position of a rod varies as \( 17.7t^2 \) radians from time \( t = 0 \). The rod has two beads on it as shown in the following figure, one at \( r_1 = 15 \) cm from the rotation axis and the other at \( r_2 = 38 \) cm from the rotation axis. (Note: figure may not be drawn to scale.)

**Diagram Explanation:**
- The diagram shows a rod rotating counterclockwise around an axis.
- Two points are marked where the beads are located: one at 15 cm and the other at 38 cm from the axis of rotation.

**Questions:**

(a) What is the instantaneous angular velocity (in rad/s) of the rod at \( t = 9 \) s? (Indicate the direction with the sign of your answer. Round your answer to at least one decimal place.)

[Textbox for answer]

(b) What is the angular acceleration (in rad/s\(^2\)) of the rod at \( t = 9 \) s? (Indicate the direction with the sign of your answer.)

[Textbox for answer]

(c) What are the tangential speeds of the beads (in m/s) at \( t = 9 \) s?

\( v_{t,1} = \) [Textbox] m/s

\( v_{t,2} = \) [Textbox] m/s

(d) What are the tangential accelerations of the beads at \( t = 9 \) s? (Enter the magnitudes in m/s\(^2\).)

\( a_{t,1} = \) [Textbox] m/s\(^2\)

\( a_{t,2} = \) [Textbox] m/s\(^2\)

(e) What are the centripetal accelerations of the beads at \( t = 9 \) s? (Enter the magnitudes in m/s\(^2\).)

\( a_{c,1} = \) [Textbox] m/s\(^2\)

\( a_{c,2} = \) [Textbox] m/s\(^2\)
Transcribed Image Text:The angular position of a rod varies as \( 17.7t^2 \) radians from time \( t = 0 \). The rod has two beads on it as shown in the following figure, one at \( r_1 = 15 \) cm from the rotation axis and the other at \( r_2 = 38 \) cm from the rotation axis. (Note: figure may not be drawn to scale.) **Diagram Explanation:** - The diagram shows a rod rotating counterclockwise around an axis. - Two points are marked where the beads are located: one at 15 cm and the other at 38 cm from the axis of rotation. **Questions:** (a) What is the instantaneous angular velocity (in rad/s) of the rod at \( t = 9 \) s? (Indicate the direction with the sign of your answer. Round your answer to at least one decimal place.) [Textbox for answer] (b) What is the angular acceleration (in rad/s\(^2\)) of the rod at \( t = 9 \) s? (Indicate the direction with the sign of your answer.) [Textbox for answer] (c) What are the tangential speeds of the beads (in m/s) at \( t = 9 \) s? \( v_{t,1} = \) [Textbox] m/s \( v_{t,2} = \) [Textbox] m/s (d) What are the tangential accelerations of the beads at \( t = 9 \) s? (Enter the magnitudes in m/s\(^2\).) \( a_{t,1} = \) [Textbox] m/s\(^2\) \( a_{t,2} = \) [Textbox] m/s\(^2\) (e) What are the centripetal accelerations of the beads at \( t = 9 \) s? (Enter the magnitudes in m/s\(^2\).) \( a_{c,1} = \) [Textbox] m/s\(^2\) \( a_{c,2} = \) [Textbox] m/s\(^2\)
**Question:** Using the parallel axis theorem, what is the moment of inertia of the rod of mass \( m \) about the axis shown below? (Use the following as necessary: \( m \) and \( L \).)

**Diagram Explanation:**

- A horizontal rod is depicted, with its total length labeled as \( L \).
- The rod is pivoted at a point located \( \frac{L}{3} \) from the left end.
- The remaining length to the right end is labeled as \( \frac{2L}{3} \).
- An arrow denotes a rotation about the pivot point (shown as a dot).

**Mathematical Expression:**

\[ I = \]

This exercise requires applying the parallel axis theorem to find the moment of inertia about the marked axis.
Transcribed Image Text:**Question:** Using the parallel axis theorem, what is the moment of inertia of the rod of mass \( m \) about the axis shown below? (Use the following as necessary: \( m \) and \( L \).) **Diagram Explanation:** - A horizontal rod is depicted, with its total length labeled as \( L \). - The rod is pivoted at a point located \( \frac{L}{3} \) from the left end. - The remaining length to the right end is labeled as \( \frac{2L}{3} \). - An arrow denotes a rotation about the pivot point (shown as a dot). **Mathematical Expression:** \[ I = \] This exercise requires applying the parallel axis theorem to find the moment of inertia about the marked axis.
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