1. A resistor and a capacitor are used in series to control the timing in the circuit of a heart pacemaker. To design a pacemaker that can double the heart rate when the patient is exercising, which statement below is true? The capacitor
(a) Needs to discharge faster, so the resistance should be decreased.
(b) Needs to discharge faster, so the resistance should be increased.
(c) Needs to discharge slower, so the resistance should be decreased.
(d) Needs to discharge slower, so the resistance should be increased.
(e) Does not affect the timing, regardless of the resistance.
2. Why is an appliance cord with a three-prong plug safer than one with two prongs?
(a) The 120 V from the outlet is split among three wires, so it isn't as high a voltage as when it is only split between two wires.
(b) Three prongs fasten more securely to the wall outlet.
(c) The third prong grounds the case, so the case cannot reach a high voltage.
(d) The third prong acts as a ground wire, so the electrons have an easier time leaving the appliance. As a result, fewer electrons build up in the appliance.
(e) The third prong controls the capacitance of the appliance, so it can't build up a high voltage.