Ex. J.7. A ladder 7.5 m long is leaning against a smooth, (frictionless) wall at a point 7.0 m above the ground with its base 2.0 m from the wall. The ladder weighs 200 N and an 800 N painter stands 2/3 of the way up the ladder. (a) What is the normal force? (b) What frictional force must act on the bottom of the ladder to prevent it from slipping for the painter to be safe?
Ex. J.7. A ladder 7.5 m long is leaning against a smooth, (frictionless) wall at a point 7.0 m above the ground with its base 2.0 m from the wall. The ladder weighs 200 N and an 800 N painter stands 2/3 of the way up the ladder. (a) What is the normal force? (b) What frictional force must act on the bottom of the ladder to prevent it from slipping for the painter to be safe?
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Transcribed Image Text:LESSON 2: ROTATIONAL EQUILIBRIUM
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· Ex. J.7. A ladder 7.5 m long
is leaning against a smooth,
(frictionless) wall at a point
7.0 m above the ground with
its base 2.0 m from the wall.
The ladder weighs 200 N
and an 800 N painter stands
2/3 of the way up the ladder.
(a) What is the normal
force? (b) What frictional
force must act on the bottom
of the ladder to prevent it
from slipping for the painter
to be safe?
7.0 m
-2.0m
HEL10m
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