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 a1 and the largest allowable deceleration az if the bundle is not to slide on the platform. 4.4 m B 0.8 m

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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 a1 as shown. The lift then decelerates
D
at a constant rate a2 and comes to rest at D, near the top of
the ladder. Knowing that the coefficient of static friction
4.4 m
between a bundle of shingles and the horizontal platform is
0.30, determine the largest allowable acceleration a1 and the
largest allowable deceleration az if the bundle is not to slide
on the platform.
aj
65°
A
В
0.8 m
Transcribed Image Text: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 a1 as shown. The lift then decelerates D at a constant rate a2 and comes to rest at D, near the top of the ladder. Knowing that the coefficient of static friction 4.4 m between a bundle of shingles and the horizontal platform is 0.30, determine the largest allowable acceleration a1 and the largest allowable deceleration az if the bundle is not to slide on the platform. aj 65° A В 0.8 m
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