Atypical nuclear reactor generates 1,000 mw (1,000 mj/s) of electrical energy. in doing so, it produces 2,000 mw of “waste heat” that must be removed from the reactor to keep it from melting down. many reactors are sited next to large bodies of water so that they can use the water for cooling. consider a reactor where the intake water is at 18° c. state regulations limit the temperature of the output water to 30° c so as to not harm aquatic organisms. how many liters of cooling water have to be pumped through the reactor each minute?

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".