A fire hose has a nozzle attached to it, and the nozzle discharges a jet of water into the atmosphere at a velocity of 20 m/s. this causes the joint of the nozzle with the hose to be in : (a) Tension (b) A state of zero stress (c) Compression (d) Bending stress

A fire hose has a nozzle attached to it, and the nozzle discharges a jet of water into the atmosphere at a velocity of 20 m/s. this causes the joint of the nozzle with the hose to be in :
 (a) Tension (b) A state of zero stress (c) Compression (d) Bending stress
by

1 Answer

Answer :

(a) Tension
by

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is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is (A) f = (P/A) + (Z/M) (B) f = (A/P) + (M/Z) (C) f = (P/A) + (M/Z) (D) f = (P/A) + (M/6Z)

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