Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 0.83 mm. Conductor B is a hollow tube of outside diameter 1.9 mm and inside diameter 1.3 mm. What is the resistance ratio RA/RB, measured between their ends?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Select all the correct answers. which two statements are true? a moving magnetic field creates an electric field. a constant magnetic field creates an electric field. a constant electric field creates a magnetic field. a moving electric field creates a magnetic field. resetnext