Tim and rick both can run at speed vr and walk at speed vw, with vr> vw. they set off together on a journey of distance d. rick walks half of the distance and runs the other half. tim walks half of the time and runs the other half.
1. in the special case that vr=vw, what would be tim's margin of victory δt(vr=vw)?

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine