A cemetery maintenance company is monitoring the displacement of tombstones that have moved by the process of creep. Tombstones must be straightened when the displacement reaches 20 cm  to prevent toppling. By measuring the tilt angle on various tombstones, they determined the creep rate in 2007 to be as shown in this table:     Date on Tombstone   Rate (mm/yr)   1929 2.09 1930 2.24 1942 2.11 1961 2.30 1978 2.27   Which tombstone will need to be straightened first

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A cemetery maintenance company is monitoring the displacement of tombstones that have moved by the process of creep. Tombstones must be straightened when the displacement reaches 20 cm  to prevent toppling. By measuring the tilt angle on various tombstones, they determined the creep rate in 2007 to be as shown in this table:
 

 
Date on Tombstone
 
Rate (mm/yr)
 
1929 2.09
1930 2.24
1942 2.11
1961 2.30
1978 2.27

 
Which tombstone will need to be straightened first?

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