How much heat does it take to raise the temperature of 9.0 kg of wood from 12c to 97c? the specific heat of wood is 1.68 kj/(kgc). use q = mc(tf - ti). a. 760 kj b. 1300 kj c. 180 kj d. 1500 kj

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".