Writer (fuse) Task 22. The electrical panel in Lily's house has 25 amps
fuses. One of them protects the electrical circuit to which
all electrical appliances from the kitchen are connected. How many kilowatts is the most
The large total power of the appliances that can be turned on
simultaneously in this circuit? The mains voltage is 220 V.

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".