A wire is suspended from the ceiling and stretched under the action of a weight \(F\) suspended from its other end. The force exerted by the ceiling on it is equal and opposite to the weight.
(a) | Tensile stress at any cross-section \(A\) of the wire is \(F/A.\) |
(b) | Tensile stress at any cross-section is zero. |
(c) | Tensile stress at any cross-section \(A\) of the wire is \(2F/A.\) |
(d) | Tension at any cross-section \(A\) of the wire is \(F.\) |
The correct statements are:
1. (a), (b)
2. (a), (d)
3. (b), (c)
4. (a), (c)
A rod of length l and negligible mass is suspended at its two ends by two wires of steel (wire A) and aluminium (wire B) of equal lengths (figure). The cross-sectional areas of wires A and B are respectively. ()
(a) | Mass m should be suspended close to wire A to have equal stresses in both wires. |
(b) | Mass m should be suspended close to B to have equal stresses in both wires. |
(c) | Mass m should be suspended in the middle of the wires to have equal stresses in both wires. |
(d) | Mass m should be suspended close to wire A to have equal strain in both wires. |
The correct statements are:
1. (b, c)
2. (a, d)
3. (b, d)
4. (c, d)