Post by: methodsboy on April 21, 2009, 05:58:08 pm
im kinda puzzled on these two questions:
2009 checkpoints:
question 530 pg 109.
Calculate the Young's Modulus for a Hookean rope of length 30m, cross sectional area = 30cm^2, which stretches 2m under a load of 1000N.
I keep getting 49751 which is approx. 5 x 10^4, answers states that it is 5 x 10^6 ???
question 534 pg 110.
Young's Modulus for material A = approx. 2.5 x 10^12. It is shaped into a square of cross-section of side 5cm and length 2m. Calculate the tensile strength of the material.
(note : you may need to refer to the graph in question 532)
It would be great if anyone can answer these questions :)
Post by: iamdan08 on April 21, 2009, 06:25:11 pm
Post by: methodsboy on April 21, 2009, 06:28:14 pm
stress = 1000/0.3 = 3333.33333
strain = 2/30 = 0.067
Young's Modulus = 3333.3333/0.067 = 49751???
Post by: iamdan08 on April 21, 2009, 06:29:42 pm
When you convert
Post by: methodsboy on April 21, 2009, 06:30:58 pm
are u sure?
When you convertto
you devide by 100^2
up to now, i've been doing /100
Post by: iamdan08 on April 21, 2009, 06:33:26 pm
Post by: methodsboy on April 21, 2009, 06:34:08 pm
Post by: danieltennis on April 21, 2009, 06:34:54 pm