University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 11, Problem 11.18E
A 15,000-N crane pivots around a friction-free axle at its base and is supported by a cable making a 25° angle with the crane (Fig. E11.18). The crane is 16 m long and is not uniform, its center of gravity being 7.0 m from the axle as measured along the crane. The cable is attached 3.0 m from the upper end of the crane. When the crane is raised to 55° above the horizontal holding an 11,000-N pallet of bricks by a 2.2-m, very light cord, find (a) the tension in the cable and (b) the horizontal and vertical components of the force that the axle exerts on the crane. Start with a free-body diagram of the crane.
Figure E11.18
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A 15,000 N crane pivots around a friction-free axle at its base and is supported by a cable making a 25° angle with the crane (see figure below). The crane is 16 m long and is not uniform, its center of gravity being 7.0 m from the axle as measured along the crane. The cable is attached 3.0 m from the upper end of the crane. When the crane is raised to 55° above the horizontal holding an 11,000 N pallet of bricks by a 2.2 m, very light cord, find (a) the tension in the cable and (b) the horizontal and vertical components of the force that the axle exerts on the crane.
The figure shows a 4.20-kg, 1.80-m-long rod hinged to a vertical wall and supported by a thin wire. The wire and rod each make
angles of 45° with the vertical. When a 10.0-kg block is suspended from the midpoint of the rod, the tension T in the supporting
wire is 49.3 N. The wire will break when the tension exceeds 75.0 N.
45°
45°
T
10kg
Tipler & Mosca, Physics for Scientists and
Engineers, 6e © 2008 W.H. Freeman and
Company
What is the maximum distance dmax from the hinge from
which the block can be suspended?
dmax
=
m
Bricks
11.18 A 15,000-N crane
pivots around a friction-free
axle at its base and is supported
by a cable making a 25° angle
with the crane (Fig. E11.18).
The crane is 16 m long and is
not uniform, its center of grav-
ity being 7.0 m from the axle as
measured along the crane. The
cable is attached 3.0 m from
the upper end of the crane.
When the crane is raised to 55°
above the horizontal holding an
55°
Axle
11,000-N pallet of bricks by a 2.2-m, very light cord, find (a) the
tension in the cable and (b) the horizontal and vertical components
of the force that the axle exerts on the crane. Start with a free-body
diagram of the crane.
Figure E11.18
Cable
25°
-0
2.2-m
cord
Chapter 11 Solutions
University Physics with Modern Physics (14th Edition)
Ch. 11.1 - Which situation satisfies both the first and...Ch. 11.2 - A rock is attached to the left end of a uniform...Ch. 11.3 - A metal advertising sign (weight w) for a...Ch. 11.4 - A copper rod of cross-sectional area 0.500 cm2 and...Ch. 11.5 - While parking your car, you accidentally back into...Ch. 11 - Does a rigid object in uniform rotation about a...Ch. 11 - (a) Is it possible for an object to be in...Ch. 11 - Prob. 11.3DQCh. 11 - Does the center of gravity of a solid body always...Ch. 11 - Prob. 11.5DQ
Ch. 11 - You are balancing a wrench by suspending it at a...Ch. 11 - You can probably stand flatfooted on the floor and...Ch. 11 - Prob. 11.8DQCh. 11 - An object consists of a ball of weight W glued to...Ch. 11 - Prob. 11.10DQCh. 11 - Prob. 11.11DQCh. 11 - In pioneer days, when a Conestoga wagon was stuck...Ch. 11 - The mighty Zimbo claims to have leg muscles so...Ch. 11 - Why is it easier to hold a 10-kg dumbbell in your...Ch. 11 - Certain features of a person, such as height and...Ch. 11 - During pregnancy, women often develop back pains...Ch. 11 - Why is a tapered water glass with a narrow base...Ch. 11 - Prob. 11.18DQCh. 11 - A uniform beam is suspended horizontally and...Ch. 11 - If a metal wire has its length doubled and its...Ch. 11 - A metal wire of diameter D stretches by 0.100 mm...Ch. 11 - Prob. 11.22DQCh. 11 - The material in human bones and elephant bones is...Ch. 11 - There is a small bui appreciable amount of elastic...Ch. 11 - When rubber mounting blocks are used to absorb...Ch. 11 - A 0.120-kg. 50.0-cm-long uniform bar has a small...Ch. 11 - Prob. 11.2ECh. 11 - A uniform rod is 2.00 m long and has mass 1.80 kg....Ch. 11 - A uniform 300-N trapdoor in a floor is hinged at...Ch. 11 - Raising a Ladder. 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