TA: Tomoyuki Nakayama
Monday, March 21, 2011
PHY 2048: Physics 1 with Calculus, Spring 2011
Review: Chapter 12.1  12.7
The purpose of this review is to refresh your memory. Physics is a cumulative subject, so make it
sure you understand basic concepts and typical problem solving techniques in previous chapters
before moving on to a new chapter!
________________________________________________________________________________
A. Rigid Bodies in Equilibrium
A uniform ladder is 5 m long and weighs 200 N. The ladder leans against a vertical, frictionless wall
at height 4 m. A horizontal force
F
is applied to the ladder at distance
d
= 1 m from the base. The
base slips to the right if the force is larger than or equal to 250 N. Find the coefficient of static
friction.
B. Elasticity
A horizontal aluminum rod 5 cm in diameter projects 10 cm from a wall. A 1000 kg object is
suspended from the end of the rod. The shear modulus of aluminum is 3×10
10
N/m
2
. Neglecting the
mass of the rod, find the vertical deflection of the rod.
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 Spring '08
 Field
 Center Of Mass, Force, Mass, Shear Stress, Shear modulus, Tomoyuki Nakayama

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