Air in a piston-cylinder is at 30°c, 100 kpa and 50% relative humidity. the air is compressed to 150 kpa in an isothermal process. the relative humidity in the final state is

Fluids at rest possess no flow energy. a)- true b)- false

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.