This question was not popular among the candidates and it was poorly attempted
Most candidates did not realize that for a body inside a upward moving lift it
experiences a weight increase hence they were unable to determine the tension
in the cable. Some candidates stated that stress = instead of stress =
Some candidates used ‘g’ instead of (a+g).
The expected answer is
Tension in the cable = (mass x acceleration) + (weight of the mass)
Stress, S = Tension
Cross-sectional area
OR
Cross-sectional
area = mass (acceleration + acceleration of free fall)
stress
OR
A = m (a+g)
A
= 2500 (0.5 + 10)
1.0 x 107
= 26.25 cm2 OR 2.625 x 10-3 m2