1. Water moving with a speed of 0.1 m / s enters a tube with a radius of 1.3 cm. It comes out of a section of tube that has a radius of 0.5 cel, and its output speed is: a) 0.26 m/s
b)0.68 m/s
c)0.04 m/s
d)0.01 m/s

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