Resistance and Current in the Human Finger The interior of the human body has an electrical resistivity of . (a) Estimate the resistance for current owing the length of your index nger. (For this calculation, ignore the much higher resistivity of your skin.) (b)Your muscles will contract when they carry a current greater than 15 mA. What voltage is required to produce this current through your nger?

Lectures 6 a nd 7 Relative Motion Motion from other p erspectives Uniform Circular Motion Speed is fixed Velocity and acceleration n ot 0 Directionally changing velocity Acceleration called “radial or centripetal” acceleration EQUATION a = v 2 c r Time it takes to complete one revolution is one “period”, T (in seconds) EQUATION v = 2πr = 1 circumference T 1 period Rotational (Angular) Rotation θis ositive g oing counterclockwise f rom p ositive xaxis (x,y) or (r, θ s coordinates arc length