A) An aluminum wire 7.5m long is connected in parallel with a copper wire 6m long. When current of 5A is passed through the combination, it is found that the current in the aluminium
wire is 3A. If the diameter of the aluminium wire is Imm, determine the diameter of the copper
wire. Assume the resistivity of copper to be 0.017u2m and that of aluminium to be 0.028 um.

Which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules? a. q b. w c. v d. u

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?