Hi I'm trying to build a desk that moves up and down electrically but i need help which and from where do i get i motor mechanism that moves up and down

During a steady flow process, the change of energy with respect to time is zero. 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.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?