The diagram below shows a person standing on a plank that pivots ona log. The person intends to cross the stream.3.0 mplank|load0.5 mloggroundgroundstream(a)cross-section. The log pivot is 0.50 m from the end of the plank.The student has a mass of 65 kg and stands at the end of theplank. A load is placed on the far end in order to balance theplank horizontally.The plank has a mass of 25 kg and is 3.0 m long with a uniformDraw on the diagram the forces that act on the plank.(b)By taking moments about the log pivot, calculate the load, in N,needed on the right-hand end of the plank in order to balance theplank horizontally.(c)Explain why the load will eventually touch the ground as thestudent walks towards the log.

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The diagram below shows a person standing on a plank that pivots on a log. The person intends to cross the stream. 3.0 m plank |load 0.5m |log ground ground stream (a) The plank has a mass of 25 kg and is 3.0 m long with a uniform cross-section. The log pivot is 0.50 m from the end of the plank. The student has a mass of 65 kg and stands at the end of the plank. A load is placed on the far end in order to balance the plank horizontally. Draw on the diagram the forces that act on the plank. (b) By taking moments about the log pivot, calculate the load, in N, needed on the right-hand end of the plank in order to balance the plank horizontally. (c) Explain why the load will eventually touch the ground as the student walks towards the log.

The diagram below shows a person standing on a plank that pivots on a log. The person intends to cross the stream. 3.0 m plank |load 0.5m |log ground ground stream (a) The plank has a mass of 25 kg and is 3.0 m long with a uniform cross-section. The log pivot is 0.50 m from the end of the plank. The student has a mass of 65 kg and stands at the end of the plank. A load is placed on the far end in order to balance the plank horizontally. Draw on the diagram the forces that act on the plank. (b) By taking moments about the log pivot, calculate the load, in N, needed on the right-hand end of the plank in order to balance the plank horizontally. (c) Explain why the load will eventually touch the ground as the student walks towards the log.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

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The diagram below shows a person standing on a plank that pivots on
a log. The person intends to cross the stream.
3.0 m
plank
|load
0.5 m
log
ground
ground
stream
(a)
cross-section. The log pivot is 0.50 m from the end of the plank.
The student has a mass of 65 kg and stands at the end of the
plank. A load is placed on the far end in order to balance the
plank horizontally.
The plank has a mass of 25 kg and is 3.0 m long with a uniform
Draw on the diagram the forces that act on the plank.
(b)
By taking moments about the log pivot, calculate the load, in N,
needed on the right-hand end of the plank in order to balance the
plank horizontally.
(c)
Explain why the load will eventually touch the ground as the
student walks towards the log.

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