1. is the type of electricity commonly used in homes and businesses throughout the world.
a. alternating current
b. direct current

2. you have created a circuit in science class. you are using a 9 volt battery. you have generated what type of current?
a. alternating current
b. direct current

for your ! < 3

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 v for 0.65 ms. the resistance of the heart muscle between the pacemaker’s electrodes is 550 ω. find (a) the current that flows during a pulse, (b) the energy delivered in one pulse, and (c) the average power supplied by the pacemaker.

In what direction does the medium move relative to the direction of the wave? explain.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?