Your friend wants to be magician and intends to use earth’s magnetic field to suspend a current-carrying wire above the stage. he asks you to estimate the minimum current needed to suspend the wire just above earth’s surface at the equator (where earth’s magnetic field is horizontal). assume the wire has a mass of 10 g, and length of 1.0 m. would you advise him to proceed with his plans for this act?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

What happens in a global convection cell