A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 14.0 m: (a) the initially stationary spelunker is accelerated to a speed of 3.90 m/s; (b) he is then lifted at the constant speed of 3.90 m/s; (c) finally he is decelerated to zero speed. How much work is done on the 81.0 kg rescue by the force lifting him during each stage? (a) Number i Units (b) Number i Units (c) Number Units

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Question

2

A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is
performed in three stages, each requiring a vertical distance of 14.0 m: (a) the initially stationary spelunker is accelerated to a speed of
3.90 m/s; (b) he is then lifted at the constant speed of 3.90 m/s; (c) finally he is decelerated to zero speed. How much work is done on
the 81.0 kg rescue by the force lifting him during each stage?
(a) Number
i
Units
(b) Number
i
Units
(c) Number
Units
Transcribed Image Text:A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 14.0 m: (a) the initially stationary spelunker is accelerated to a speed of 3.90 m/s; (b) he is then lifted at the constant speed of 3.90 m/s; (c) finally he is decelerated to zero speed. How much work is done on the 81.0 kg rescue by the force lifting him during each stage? (a) Number i Units (b) Number i Units (c) Number Units
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