The diagram shows parts of a magnetic relay. M is part of the core of the magnet. L is part of the amateur which is attracted to the core when a current flows through the coil. S is a stud which stops the amateur being attracted too strongly.

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Smallest intensity of a stimulus that you can detect 50 percent of the time is

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?