How can we solve problems in scientific way?

What are examples of simple machines you use everyday? Why do you use a tourniquete? Why you cant play game on your laptop it seems 3D software not installed? When was the syringe invented? How Exampes of Accounting Rate of Return - ARR? What is the r rating of concrete block? Difference between equipment and instrument? Why a circuit is protected by a circuit breaker? Can a structure be assigned to another using assignment operator? Write a program to generate uppercase using cSharp? Is it ok to use 1 nine volt power pack with 4 small 12 volt fans? Groundwater contaminated by sewage from a ruptured septic tank can sometimes be naturally purified by flowing for a relatively short distance through a? What is the difference between BSPT and NPT? What size wire and breaker for a 30 hp 240 volt 3 phrase motor? What are the forces acting on landing gear during landing? How do you calculate kw in three phase generator? Write a Program in lisp to find maximum of three numbers? If a DIODE or RECTIFIER can handle 1000V and 75Amps is it also safe to run the same diode at 20V and 300Amps. The first is 75000Watts and the second is only 6000Watts in theory it should work..? What are the importance of dressmaking in daily live of a student? What is simulation in a vlsi design?