An electric utility company supplies a customer's house from the main power lines (120 V) with two copper wires, each of which is 66.0 m long and has a resistance of 0.111 2 per 300 m. (a) Find the potential difference at the customer's house for a load current of 109 A. V (b) For this load current, find the power delivered to the customer. kw (c) Find the rate at which internal energy is produced in the copper wires. W

115V is applied across a wire with a radius of 0.400mm. The wire is 10.0m long and has a current density of 1.2x10^8 A/m^2. Find (a) the resistivity of the wire (b) the resistance of the wire (c) the current through the wire (d) the new current through the wire when the current density now varies with radius, J = (1.20x10^8) x r^2 A/m^2, where J is in A/m^2 and r is in meters.

The cord from an appliance is too short to reach the wall outlet in your room. You have two extension cords to choose from. (a) Find the voltage drop in the first extension cord having a 0.0360 resistance and through which 6.20 A is flowing. v (b) The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.072 N and the current flowing through it is 6.20 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second?

An electric utility company supplies a customer's house from the main power lines (120 V) with two copper wires, each of which is 46.0 m long and has a resistance of 0.109 2 per 300 m. (a) Find the potential difference at the customer's house for a load current of 102 A. V (b) For this load current, find the power delivered to the customer. kW

In a certain article, laser therapy was discussed as a useful alternative to drugs in pain management of chronically ill patients. To measure pain threshold, a machine was used that delivered low-voltage direct current to different parts of the body (wrist, neck, and back). The machine measured current in milliamperes (mA). The pretreatment experimental group in the study had an average threshold of pain (pain was first detectable) at ? = 3.19 mA with standard deviation ? = 1.03 mA. Assume that the distribution of threshold pain, measured in milliamperes, is symmetric and more or less mound-shaped. (Round your answers to two decimal places.) (a) Use the empirical rule to estimate a range of milliamperes centered about the mean in which about 68% of the experimental group will have a threshold of painfrom  mA to  mA(b) Use the empirical rule to estimate a range of milliamperes centered about the mean in which about 95% of the experimental group will have a threshold of painfrom  mA to…

Please answer carefully, last attempt.