The diagram shows a safety valve which releases steam when the pressure rises above a pre-determined value. The mass of the rod and the valve cover are negligible.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Answer A45 b(i), (ii) & (iii)

A45 (a) State the conditions for equilibrium for a
body which is acted upon by a system of
coplanar forces.
(b) The diagram shows a safety valve which
releases steam when the pressure rises
above a pre-determined value. The mass
of the rod and the valve cover are
negligible.
5.0 cm
50 cm
Fivot"
Valve
Rod
cover
5.0kg
Steam
preusure
vessel
(i) Sketch a diagram showing the forces
acting on the rod when there is
normal atmospheric pressure in the
steam vessel.
(ii) Determine the magnitude of the
force at the valve which just opens
the valve.
(ii) The outlet has a cross-sectional area
of 2.0 cm. Using the force calcu-
lated in (b)(ii) determine the excess
pressure above atmospheric pres-
sure in the vessel when the valye
just opens. Give your answer in
pascals (Pa).
[АЕВ, "90]
Transcribed Image Text:A45 (a) State the conditions for equilibrium for a body which is acted upon by a system of coplanar forces. (b) The diagram shows a safety valve which releases steam when the pressure rises above a pre-determined value. The mass of the rod and the valve cover are negligible. 5.0 cm 50 cm Fivot" Valve Rod cover 5.0kg Steam preusure vessel (i) Sketch a diagram showing the forces acting on the rod when there is normal atmospheric pressure in the steam vessel. (ii) Determine the magnitude of the force at the valve which just opens the valve. (ii) The outlet has a cross-sectional area of 2.0 cm. Using the force calcu- lated in (b)(ii) determine the excess pressure above atmospheric pres- sure in the vessel when the valye just opens. Give your answer in pascals (Pa). [АЕВ, "90]
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