Andy has two strong magnetic marbles of equal size. what will happen when he puts the two marbles about 2 centimeters apart? a)they will roll towards each other and stick together. b)they will roll away from each other and push apart. c)one will attract the other one. d)the two marbles will not move.

What are two different ways you could find the value of a? explain these methods.

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Acircuit is built based on this circuit diagram what is the equivalent resistance of the circuit? a.0.61 b.1.6 c.7.5 d.18