A thin, cylindrical rod t = 20.4 cm long with a mass m = 1.20 kg has a ball of diameter d = 10.00 cm and mass M = 2.00 kg attached to one end. The arrangement is originally vertical and stationary, with the ball at the top as shown in the figure below. The combination is free to pivot about the bottom end of the rod after being given a slight nudge. M (a) After the combination rotates through 90 degrees, what is its rotational kinetic energy? 6.18 (b) What is the angular speed of the rod and ball? 9.15 v rad/s (c) What is the linear speed of the center of mass of the ball? 2.32 v m/s (d) How does compare with the speed had the ball fallen freely through the same distance of 25.4 cm? Vswing is ---Select--- val by 3.88 Your response differs from the correct answer by more than 10%. Double check your calculations.%.

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Chapter1: Units, Trigonometry. And Vectors
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A thin, cylindrical rod \(\ell = 20.4 \, \text{cm}\) long with a mass \(m = 1.20 \, \text{kg}\) has a ball of diameter \(d = 10.00 \, \text{cm}\) and mass \(M = 2.00 \, \text{kg}\) attached to one end. The arrangement is originally vertical and stationary, with the ball at the top as shown in the figure below. The combination is free to pivot about the bottom end of the rod after being given a slight nudge.

---

**(a)** After the combination rotates through 90 degrees, what is its rotational kinetic energy?
- **Answer:** \(6.18 \, \text{J}\)

**(b)** What is the angular speed of the rod and ball?
- **Answer:** \(9.15 \, \text{rad/s}\)

**(c)** What is the linear speed of the center of mass of the ball?
- **Answer:** \(2.32 \, \text{m/s}\)

**(d)** How does it compare with the speed had the ball fallen freely through the same distance of \(25.4 \, \text{cm}\)?
- **Note:** \( v_{\text{swing}} \) is left blank, and there's a notice:
  - **"Your response differs from the correct answer by more than 10%. Double check your calculations."**

---

**Explanation of Diagram:**

The diagram shows a vertical setup where a cylindrical rod is attached to a pivot at the bottom. A ball is attached at the top of the rod. The rod and ball together form a pendulum-like system which can freely rotate around the pivot.
Transcribed Image Text:A thin, cylindrical rod \(\ell = 20.4 \, \text{cm}\) long with a mass \(m = 1.20 \, \text{kg}\) has a ball of diameter \(d = 10.00 \, \text{cm}\) and mass \(M = 2.00 \, \text{kg}\) attached to one end. The arrangement is originally vertical and stationary, with the ball at the top as shown in the figure below. The combination is free to pivot about the bottom end of the rod after being given a slight nudge. --- **(a)** After the combination rotates through 90 degrees, what is its rotational kinetic energy? - **Answer:** \(6.18 \, \text{J}\) **(b)** What is the angular speed of the rod and ball? - **Answer:** \(9.15 \, \text{rad/s}\) **(c)** What is the linear speed of the center of mass of the ball? - **Answer:** \(2.32 \, \text{m/s}\) **(d)** How does it compare with the speed had the ball fallen freely through the same distance of \(25.4 \, \text{cm}\)? - **Note:** \( v_{\text{swing}} \) is left blank, and there's a notice: - **"Your response differs from the correct answer by more than 10%. Double check your calculations."** --- **Explanation of Diagram:** The diagram shows a vertical setup where a cylindrical rod is attached to a pivot at the bottom. A ball is attached at the top of the rod. The rod and ball together form a pendulum-like system which can freely rotate around the pivot.
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