Circuit variable problem

A current of 1400 A exits in a rectangular (0.6 X 9.0)cm copper bus bar. The current is due to free electrons moving through the bus bar at an average velocity of v meters/second. If the concentration of free electrons is 10^29 electrons per cubic meter and if they are unifomly dispered throughout the bus bar, then what is the average velocity of an electron?? I'm stuck on this problem. Please show step by step work.

Circuits problem

In electronic circuits it is not unusual to encounter currents in the microamperage range. Assume a 20 micro amp current, due to the flow of electrons. a) What is the average number of electrons per second that flow past a fixed reference cross section that is perpendicular to the direction of flow. b) Compare the size of this number to the number of micrometers between Miami and Seattle. You may assume the distance is 3303 mi. Please show all work step by step and include drawings for visual reference

Extracted energy

How much energy is extracted from an electronas it flows through a 9V battery from positive to the negative terminal? Express answer in joules. Please show all work step by step and include diagrams fo visual reference.

Circuit variable problem

Please see attached.. The voltage and current at the terminals of the circuit elements in Fig 1.5 are zero for t<0 nad t<40s. In the interval between 4 and 40s the expressions are... (a) At what instant of time is the power being delivered to the circuit element maximum? (b) What is the power at the time found in part (a) (c) At what instant of time is the power being extracted from the circuit element maximum? (d) What is the power at the time found in part (b) (e) Calculate the net energy delivered to the circuit at 0, 10, 20, 30, and 40 s. Please see attached.

Circuit variable problem

Please see attached.. The voltage and current at the terminals of the circuit element in Fig. 1.5 are zero for... Please see attached.