A lift with weight W is being raised by a rope accelerating at rate f. Given that the rope has a cross-sectional area A, what is the stress experienced by the rope?

Explanation

The stress in the rope is calculated by considering both the weight of the lift and the additional force due to acceleration. Hence, the stress equals the weight multiplied by (1 plus the acceleration divided by gravitational acceleration), all over the cross-sectional area, resulting in [W (1 + f / g)] / A.