3) When the bar is subjected to the torque T, the length L a. Remains unchanged
ID: 2086169 • Letter: 3
Question
3) When the bar is subjected to the torque T, the length L a. Remains unchanged b. Shortens c. Elongates d. None of the above 4) Which of the following statements is true? The flexure formula for a straight member can be applied only a) when bending occurs about axes that represent the principal axes of inertia for the section. b) the principal axes have their origin at the centroid. c) the principal axes are orientated along an axis of symmetry, if there is one, and perpendicular to it d) all of the above. Formula Mc Ao MyB TL plExplanation / Answer
1.when bar is subjected to torque T, the length L
Answer. "A"
Explanation: If the angle of rotation is small or smaller rotation, the length of the shaft and its radius will remain unchanged
2. The flexure formula for a straight member can be applied only
Answer. "D"
Explanation: The flexure formula can be applied only when bending occurs about the axes that represent the principal axes of inertia for the cross section .
Principal axes have their origin at the centroid and are orientated along an axis of symmetry, if there is one, and perpendicular to it.
If the moment is applied about an arbitrary axis, then the moment must be resolved into components along each of the principal axes.
Use flexure formula to determine normal stress caused by each moment component.
Use principle of superposition to determine resultant normal stress at the point
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