What is an action potential? a) chemicals released by glands b) atp generated by the sodium/potassium pump c) neurotransmitters that travel from the end of the axon to an effector d) electrical signals that are generated by the movement of ions across the cell membrane of a neuron

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.