Q. State the condition that is necessary for a charge to move in a wire. Relate the definition of electric current to the units of current. Explain the cause of resistance and how the resistance of a wire can be determined. Compute the voltage to produce a current of 2.0 A in a wire with a resistance of 16().Calculate the amount of current in your fingers if they touch the terminals of 12 V battery while the resistance of your skin is 650 ().Compare superconductors and semiconductors with conductors and insulators.
Q. A 2.10 x 10^3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20 degrees with the horizontal. An average friction force of 4 x 10^3 N impedes the cars motion so that the cars speed at the bottom of driveway is 3.80 m/s. What is the length of the driveway?