PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
5th Edition
ISBN: 9780134378060
Author: GIANCOLI
Publisher: RENT PEARS
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Textbook Question
Chapter 4, Problem 13P
(II) A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in Fig. 4–31. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box.
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Students have asked these similar questions
11. (II) A 20.0-kg box rests on a table. (a) What is the weight
of the box and the normal force acting on it? (b) A 10.0-kg
box is placed on top of the 20.0-kg box, as shown in
Fig. 4–43. Determine the normal force that the table exerts
on the 20.0-kg box and the normal force that the 20.0-kg
box exerts on the 10.0-kg box.
10.0 kg
20.0 kg
FIGURE 4–43
Problem 11.
(I) A box weighing 77.0 N rests on
a table. A rope tied to the box runs
vertically upward over a pulley and
a weight is hung from the other
end (Fig. 4–45). Determine the
force that the table exerts on
the box if the weight hanging
on the other side of the pulley
weighs (a) 30.0 N, (b) 60.0 N, and
(c) 90.0 N.
FIGURE 4-45
Problem 20.
(2) A stack of two crates is being lifted upwards by two cables, as shown in the figure below. The tension
in each cable is 2270 N. You may assume that the masses of the cables are negligible compared to the
masses of the crates. Do not use Newton's 3rd Law; use only Newton's 2nd Law.
(a) Using Newton's 2nd Law, calculate the force that the top crate exerts on the bottom crate and the force
that the bottom crate exerts on the top crate.
(answer: Fotom on-top = Fop on-bottom= 3062 N)
(b) The maximum tension that each cable can handle without breaking is 3230 N. Calculate the maximum
abottom-on-top
%3D
mtop-on-
upward acceleration that the load can have without breaking the cables. (answer: 8.97 m/s²)
232 kg
112 kg
Chapter 4 Solutions
PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
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