Question
Question: A steel wire with cross section 3 cm<sup>2</sup> has elastic limit 2.4 × 10<sup>8</sup> Pa. Find the...
A steel wire with cross section 3 cm2 has elastic limit 2.4 × 108 Pa. Find the maximum upward acceleration that can be given to a 1200 kg elevator supported by this cable if the stress is not to exceed 1/3rd of the elastic limit.
A
9 ms-2
B
10 ms-2
C
11 ms-2
D
12 ms-2
Answer
10 ms-2
Explanation
Solution
1200 × (g + a) = 31 × 2.4 × 108 × 3 × 10-4 or a = 10 ms-2