https://3.bp.blogspot.com/-UFycYotC5eg/Vupe7qsMYXI/AAAAAAAACqY/K6Y2cKgnymAnckeOZkB4J0kiVuR7O7DMA/s640/w2.jpg
https://2.bp.blogspot.com/-UA4Iw4GTFy0/VupfDEKo6XI/AAAAAAAACqc/bvWI_Y96OIQ0aLFDMbJfVFWtj3B4hCO8Q/s640/w3.jpg
How to evaluate resonanse ( DOPPLER EFFECT )
https://1.bp.blogspot.com/-EzknZRsV60Q/VupAryQvriI/AAAAAAAACqI/4TXh-TRQrFEJVdKKO0QQFCJjO_8X8SOpQ/s1600/mm1.jpg
Without physics You will not able build perfect machines
study please
http://maroszphysics.blogspot.com/