To transport a series of bundles of shingles A to a roof, a contractor uses a motor-driven lift consisting of a horizontal platform BC which rides on rails attached to the sides of a ladder. The lift starts from rest and initially moves with a constant acceleration a, as shown. The lift then decelerates at a constant rate az and comes to rest at D, near the top of the ladder. Knowing that the coefficient of static friction between a bundle of shingles and the horizontal platform is 0.30, determine the largest allowable acceleration a, and the largest allowable deceleration az if the bundle is not to slide on the platform.

To transport a series of bundles of shingles A to a roof, a contractor uses a motor-driven lift consisting of a horizontal platform BC which rides on rails attached to the sides of a ladder. The lift starts from rest and initially moves with a constant acceleration a, as shown. The lift then decelerates at a constant rate az and comes to rest at D, near the top of the ladder. Knowing that the coefficient of static friction between a bundle of shingles and the horizontal platform is 0.30, determine the largest allowable acceleration a, and the largest allowable deceleration az if the bundle is not to slide on the platform.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Dynamics, please solve correctly and understandable.

To transport a series of bundles of shingles A to a roof, a contractor uses a motor-driven
lift consisting of a horizontal platform BC which rides on rails attached to the sides of a
ladder. The lift starts from rest and initially moves with a constant acceleration a, as
shown. The lift then decelerates at a constant rate az and comes to rest at D, near the
top of the ladder. Knowing that the coefficient of static friction between a bundle of
shingles and the horizontal platform is 0.30, determine the largest allowable acceleration
a, and the largest allowable deceleration az if the bundle is not to slide on the platform.
D
4.4 m
0.8 m

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