Suppose you want to enforce the following constraint: when inserting a tuple into the purchase relation, custid must also exist in the customer relation. if custid does not exist in the customer table, automatically insert it into the customer table (you can set the zipcode value to be null). write a trigger statement to do this;

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.