Aconducting bar of length , moves to the right on two frictionless rails. a uniform magnetic field directed into the page has a magnitude of 0.300 t. assume r = 9.00 ohm and , length (l) = 0.350 m. at what constant speed should the bar move to produce an 8.50- ma current in the resistor?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

The energy produced as a result of this flow of electrons from atom to atom is called

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.