What is the using of technological and scientific knowledge to solve practical problems?

How far below the frost line does a concrete footing need to reach? What is caused when an application does not properly release memory allocated to it that it no longer needs and continually requests more memory than it needs? What is a component of the CSS box model? What is a real diode? Why do you need a height tempertaure to join two pieces of metal by welding? Define peephole optimization? What is man instrument system? Why is it important to keep cleaning equipment well maintained? Dimensions of a plastic milk jug? What was invented by John Deere and increased productivity for farmers on the Great Plains? What is the study for driving railway trains? Who invented petrol engine and how was its working? Where can a DC exciter be found? Why we use j in the impedance of a capacitor Why not any other alphabet? Write program to convert a string in lower case without using library function? What emf stands for? What are 2 advantages of a hydraulic system? What is the equivalent ASTM material for RST37-2? How can you connect a 3 phase pressure cooker to a single phase supply? Which one of the following statements is true of a split phase motor when it is starting the speed is high the torque is high the current is low the voltage is low?