- #1
donjt81
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First part of the question:
A high speed lifting mechanism supportsa 711kg object with a steel cable 24.9m long and 3.83cm(squared) in cross sectional area. Determine elongation of the cable.
I think I got this first part right... can anyone confirm my approach.
stress = F/A
F = mg = 711*9.8
A = .0383
strain = stress/Y
and then
elongation delta L = Lo * strain
Is this how you find elongation?
Second part of the question
By what additional amount does the cable increase in length if the object is accelerated upward at a rate of 3.3m/s2?
This was my approach to the second part. not sure if this is correct...
stress = F/A
but this time F = ma - mg (is this correct?)
everything else will be the same as the first part.
can someone please verify both these please.
Thanks in advance
A high speed lifting mechanism supportsa 711kg object with a steel cable 24.9m long and 3.83cm(squared) in cross sectional area. Determine elongation of the cable.
I think I got this first part right... can anyone confirm my approach.
stress = F/A
F = mg = 711*9.8
A = .0383
strain = stress/Y
and then
elongation delta L = Lo * strain
Is this how you find elongation?
Second part of the question
By what additional amount does the cable increase in length if the object is accelerated upward at a rate of 3.3m/s2?
This was my approach to the second part. not sure if this is correct...
stress = F/A
but this time F = ma - mg (is this correct?)
everything else will be the same as the first part.
can someone please verify both these please.
Thanks in advance