A high-voltage copper transmission line with a diameter of 2.40 cm and a length of 250 km carries a steady current of 1.25 103 A. If copper has a free charge density of 8.46 1028 electrons/m3, over what time interval does one electron travel the full length of the line

There are weak or strong attractive forces between atoms of liquids with a high viscosity

What is the single most important equation in all of physics?

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?