Answered: a 55 kg rock climber is in a lie-back…

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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Question

a 55 kg
rock climber is in a lie-back climb
along a fissure, with hands pulling on
one side of the fissure and feet
pressed against the opposite side.
The fissure has width w = 0.20 m,
and the center of mass of the climber
is a horizontal distance d = 0.40 m
from the fissure. The coefficient of
static friction between hands and
rock is m1 = 0.40, and between boots
and rock it is m2 = 1.2. (a) What is the least horizontal pull by the hands and push by the feet that
will keep the climber stable? (b) For the horizontal pull of
(a), what must be the vertical distance h between hands and feet? If the climber encounters wet rock, so
that m1 and m2 are reduced, what happens
to (c) the answer to (a) and (d)
the answer to (b)?

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