Q.12 FIGURE Q10.12聽is the energy bar... [FREE SOLUTION]

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Chapter 10: Q.12 (page 255)

FIGURE $Q 10.12$ is the energy bar chart for a firefighter sliding down a fire pole from the second floor to the ground. Let the system consist of the firefighter, the pole, and the earth. What are the bar heights of Wext, Kf, and UGf?

Short Answer

Expert verified

Since $W_{eat}$ and $U_{f}$ is zero, $K_{f}$ must be two blocks high.

Step by step solution

Introduction

The following is the energy conservation equation:

$K_{i} + U_{g i} + W_{e s} = K_{r} + U_{g r} + 螖 E_{th}$

Here $K_{i}$ is the initial kinetic energy, $U_{g i}$ initial potential energy, $K_{f}$ is the final kinetic energy, $U_{g,}$ final potential energy. $螖 E_{wh}$ is the thermal energy and $W_{ed}$ is the work done by the external force.

Explanation

There is no work done if the pole and the earth are included in the system. $(W_{e a t})$ .Also, at the lowest position, there is no gravitational potential energy, but there is some kinetic energy. The heights of the bars on the right side should add up to the same amount as the heights of the bars on the left side. Since $W_{eat}$ and $U_{f}$ is zero, $K_{f}$ must be two blocks high. The corresponding energy bar chart is as follows,

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91影视

FIGURE $Q 10.12$ is the energy bar chart for a firefighter sliding down a fire pole from the second floor to the ground. Let the system consist of the firefighter, the pole, and the earth. What are the bar heights of Wext, Kf, and UGf?

Short Answer

Step by step solution

Introduction

Explanation

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91影视

FIGURE Q10.12is the energy bar chart for a firefighter sliding down a fire pole from the second floor to the ground. Let the system consist of the firefighter, the pole, and the earth. What are the bar heights of Wext, Kf, and UGf?

Short Answer

Step by step solution

Introduction

Explanation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Classical Mechanics

Geometrical and Physical Optics

Electrostatics

Torque and Rotational Motion

Turning Points in Physics

Fluids

Study anywhere. Anytime. Across all devices.

FIGURE $Q 10.12$ is the energy bar chart for a firefighter sliding down a fire pole from the second floor to the ground. Let the system consist of the firefighter, the pole, and the earth. What are the bar heights of Wext, Kf, and UGf?