5. a cyclist is traveling along a level, straight road at 10 m/s in the positive direction with a x; = v. in
magnitude of the velocity for the cyclist is tracked using the following motion graph.
velocity-time graph
velocity (m/s)
0 1 2 3 4 5
time (s)
according to the information and graph shown above, what is the magnitude of the acceleration for the first
two seconds?
a. 2 m/s2 ~
c. 12 m/s2
b. 24 m/s2
d. 1 m/s2

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?