Agas has an initial volume of 24.6 l at a pressure of 1.90 atm and a temperature of 335 k. the pressure of the gas increases to 3.50 atm, and the volume of the gas increases to 31.3 l. what is the final temperature of the gas? 143 k 231 k 485 k 785 k

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".