A thin copper rod 1.5 m long has a mass of 0.070 kg and is in a magnetic field of 0.20 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air