COLLEGE PHYSICS - LCPO
4th Edition
ISBN: 9780134700427
Author: Knight
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 53GP
Problems 49 through 61 describe a situation. For each problem, draw a motion diagram, a force identification diagram, and a free-body diagram.
49. An elevator, suspended by a single cable, has just left the tenth floor and is speeding up as it descends toward the ground floor.
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It takes the elevator in a skyscraper 5.0 s to reach its cruising speed of 12 m/s. A 65 kg
passenger gets aboard on the ground floor.
Part A
What is the passenger's weight before the elevator starts moving?
Express your answer with the appropriate units.
Part B
What is the passenger's weight while the elevator is speeding up?
Express your answer with the appropriate units.
Part C
What is the passenger's weight after the elevator reaches its cruising speed?
Express your answer with the appropriate units.
A block having a mass of m = 12 kg is suspended via two cables as shown in the figure. The angles shown in the figure are as follows: α = 14° and β = 35°. We will label the tension in Cable 1 as T1 and the tension in Cable 2 as T2.
1. Please draw a Free Body Diagram for the block.
2. Solve for the numeric value of T1, in newtons.
3. Solve for the numeric value of T2, in newtons.
A cardboard box rests on the floor of an elevator. The box has a mass m = 2.75 kg and the elevator has an upward acceleration of a.
a. Write an expression for the sum of the forces acting on the box in the y-direction, ΣFy, given that up is the positive y-direction. Your answer should be in terms of FN, m, and g.
b. Write an expression for the normal force, FN, that the block experiences in terms of the elevator's acceleration, the block's mass, and the acceleration of gravity.
c. If the elevator's acceleration has a magnitude of g in the downward direction, what would the normal force, FN1 be in Newtons?
d.If the elevator's acceleration had a magnitude of g in the upward direction, what would the normal force FN2 be in Newtons?
Chapter 4 Solutions
COLLEGE PHYSICS - LCPO
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