I am needing to confirm an answer for simple valve question.I have a control valve that has an inlet pressure of 100psi. It has an outlet pressure of 25 psi. The spool (piston) has a5 in2 bottom and 10 in2 top. What must the pressure on top of the 10 in2 piston be to enable this valve to just start to open?

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

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