Asilver wire 2.6 mm in diameter transfers a charge of 420 cin 80 min. silver contains 5.8 x 10^{28} free electrons per cubic meter.
what is the current in the wire?
what is the magnitude of the drift velocity of the electronsin the wire?

Several students in the group made comments to the coach about the back pack. which student has the correct analysis of the forces and motion of the back pack?

In an experiment, how can i change human errors? be specific.

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".