2. which of the following correctly identifies active transport? (1 point)
transport proteins move large molecules from areas of low concentration to areas of high concentration using cellular
energy
transport proteins move large molecules from areas of low concentration to areas of high concentration without the use of
cellular energy
small molecules move from areas of high concentration to areas of low concentration using cellular energy to enter a cell.
small molecules move from areas of low concentration to areas of high concentration without using cellular energy to enter a
cell.

Disney, viacom and aol time warner are examples of

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

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".