The article implies a causal link, with gaining father's acceptance (the explanatory variable) resulting in better grades (the response variable). Which of the remaining six reasons for relationships between variables (reasons 2 through 7) could explain the observed connection

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.

Aseries piping system conveys methyl alcohol. the system consists of 70 m of 1- nominal pipe follow by 50 m of 2-nominal pipe, both schedule 40 commercial steel. the 1-nominal pipe contains 3 90° elbows (regular) anda fully open gate valve, all threaded. the pressure drop through the system is 150 kpa. determine the volume flow rate through the system that is horizontally laid.