2)
Plasma is a state of matter used in neon signs and plasma TVs. According to the model, what question should be asked in the formation of plasma?
A) At what temperature will a substance undergo sublimation?
B) How will a decrease in energy result in plasma formation?
C) At what energy level will the substance take the shape of its container?
D) At what temperature does will particles move so fast that electrons are stripped from the substance?

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".