a auto race is held on a circular track. a car completes one lap in a time of 18.9 s, with an average tangential speed of 42.6 m/s. Find (a) the average angular speed and (b) the radius of the track.

the answer is d

explanation:

dan realized that his goal of going to an ivy league school if only he works hard which means basically this   to become completely aware of (something) as a fact; understand without a doubt to make (something desired or anticipated) occur to give real, definite or physical form to a plan, dream, or goal to earn (money or a profit) from a deal

c

explanation:

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.